4fe072283dab5a498762dc48c952c60cd16bdc91
5 Commits
| Author | SHA1 | Message | Date | |
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Tom Boucher
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0624c5da6f |
chore(#3212): src/text-lines.cts is the sole owner of line-terminator handling — Phase 2 (#3420)
* test(#3413): failing-first suite for the line-terminator seam Phase 2 of epic #3212 (ADR-3212 §3/§6/§7). Tests only — src/text-lines.cts does not exist yet, so tests/text-lines.test.cjs fails with MODULE_NOT_FOUND at its require line, which is the intended RED. The frontmatter.test.cjs additions drive #3360 (confirmed-bug) fail-first: parseMustHavesBlock currently returns [] for every must_haves block on a CRLF-authored plan file, because \r is its own LineTerminator in ECMAScript and two /m-anchored \s* patterns can absorb it, inflating a captured indent by one character and tripping the "not nested under must_haves" guard. Verified locally against the current (unfixed) compiled module: both the direct repro and the silent-exit "blank line before must_haves:" variant return [] today. A parity property test (crlf vs lf must deep-equal for every block name) matches a pattern this maintainer has required repeatedly for prior CRLF fixes in this codebase (Cortex-recorded, verify_intent=held). The no-crlf-fragile-split.rule.test.cjs additions lock the eslint rule's future fix-hint text (pointing at splitLines()) and its self-reference non-violation (the seam's own correct \r?\n split must never flag itself). Design: .gsd/phase/chore-3413-text-lines-seam/40-design.md Test matrix: .gsd/phase/chore-3413-text-lines-seam/50-test-matrix.md * chore(#3413): src/text-lines.cts owns line-terminator handling Phase 2 of epic #3212 (ADR-3212 §3/§6/§7). Adds splitLines/normalizeEol/ detectEol/joinLines and migrates frontmatter.cts onto it. parseMustHavesBlock (#3360, confirmed-bug) returned [] for every must_haves block on a CRLF plan file. Root cause: \r is its own LineTerminator in ECMAScript, so under /m two \s*-anchored indentation lookups could match at the position INSIDE a \r\n pair and absorb the terminator, inflating the captured indent by one character and tripping the "not nested under must_haves" guard. Two silent exits, one with a diagnostic and one without (a blank line before must_haves: hits the silent path). Fixed by converting both lookups from a whole-string /m match to split-then-scan — splitLines first, then a per-line, non-/m match — the same structural pattern parseYamlRegion (30 lines away in the same file) already used safely. Nothing downstream of the two lookups changed; blockLines is now sliced from the already-split array instead of re-splitting a substring, but its contents are unchanged for LF input, and the per-line dash/kv parsing loop is untouched. A parity property test (CRLF and LF plans parse to identical must_haves for every block name) matches a pattern this maintainer has required repeatedly for prior CRLF fixes in this file's neighborhood (Cortex: 7 recorded decisions, verify_intent -> held). frontmatter.cts's other .split(/\r?\n/) call sites (parseYamlRegion, isFrontmatterShaped, sliceTopLevelFrontmatterSegments, spliceFrontmatter) are rerouted onto splitLines — a literal 1:1 substitution, zero behavior change, since splitLines IS that same regex plus a type guard. The 4 scripts/normalizeLineEndings copies (gen-registry, gen-loop-host- contract, gen-capability-registry, gen-context-index) are deleted and rerouted onto normalizeEol, which strips a bare unpaired \r exactly like the deleted copies did (not just \r\n pairs) -- verified against each script's own --check mode against its real generated output. local/no-crlf-fragile-split widens from tests/ to src/**/*.cts, with its fix-hint message now naming splitLines() instead of the raw regex -- the prohibition finally has a primitive to point at. Detection logic unchanged in this phase (deliberate scope limit, see design doc Known limits: the rule doesn't yet recognize safeReadFile/platformReadSync as a content source, and has no detector for the \s-adjacent-to-anchor shape that is #3360's actual mechanism -- the CLASS is converged by the direct fix + regression test regardless). joinLines/detectEol are NOT wired into frontmatter.cts's own write path (cmdFrontmatterSet/Merge -> platformWriteSync) -- verified that platformWriteSync already, unconditionally converts CRLF->LF on every .md write today as a pre-existing policy owned by a different module, and ADR-3212's backward-compatibility clause rules out a file-format change in any phase. Stated explicitly in Known limits rather than left for a reader to discover. Six-gate ripple: .gitignore, eslint.config.mjs (src/**/*.cts block), docs/INVENTORY.md + INVENTORY-MANIFEST.json (regenerated), CONTEXT.md glossary (Text Lines Module, mirroring Phase 1's Pattern Module entry). Design: .gsd/phase/chore-3413-text-lines-seam/40-design.md Test matrix: .gsd/phase/chore-3413-text-lines-seam/50-test-matrix.md * fix(#3413): fix 13 pre-existing CRLF-fragile splits the widened rule found Widening local/no-crlf-fragile-split from tests/ to src/**/*.cts (the previous commit) immediately surfaced 13 real, pre-existing violations across 10 files -- undetected until now because the rule never scanned src/. This is the exact defect class ADR-3212 exists to close, playing out again one phase after Phase 1 hit the same shape ("the new lint rule -- once live -- found 27 more"). Per CLAUDE.md's no-defer rule, fixed inline rather than deferred or suppressed; there is no established suppression convention for this rule in src/ and inventing one now would undermine the point of widening it. audit.cts, broken-windows.cts, core-utils.cts, init.cts, milestone.cts, phase.cts (x3), profile-output.cts, roadmap.cts (x2): bare-\n splits or regex character classes widened to \r?\n / [^\r\n], each following the same pattern already established migrating frontmatter.cts. phase-estimation.cts: `\r?(?:\n|$)` restructured to `(?:\r?\n|\r?$)` -- already semantically CRLF-safe, but the rule's lexical scanner doesn't recognize \r? guarding a group (only \r? immediately before a literal \n). Verified the two forms are equivalent across all four EOL/EOF cases before restructuring, not assumed. roadmap-upgrade.cts needed two coupled sites, not the one flagged line: computeMigrationPlan and applyMigration must agree on line representation for the lines[edit.lineIndex] === edit.from equality check to hold, and the write-back needed joinLines + detectEol -- a plain lines.join('\n') was silently flattening a CRLF ROADMAP.md to LF wholesale on every migration. This is the first real production consumer of joinLines/detectEol in this epic (frontmatter.cts's own write path doesn't use them -- see the previous commit's Known limits). Fixing the 13 flagged sites surfaced 4 more adjacent same-shape sites the rule doesn't track (.search() and new RegExp(dynamicString) aren't in its tracked call/construction set). Investigated each empirically -- hand-tracing this exact bug class already produced one wrong conclusion earlier in this phase (a detectEol design-doc arithmetic error), so these were verified with real CRLF fixtures rather than reasoned about on paper: - audit.cts (scanTodos): REAL bug, fixed. `bodyMatch.trim().split ('\n')[0]` leaked a trailing \r into a user-visible todo summary on CRLF input -- .trim() only strips the string's outer edges, not a \r sitting mid-string before the first bare \n. Now splitLines(...) [0]. - phase.cts (cmdPhaseInsert, bullet-style branch): REAL bug, fixed. [^\n]* in targetBulletPattern swallowed a line's trailing \r on CRLF input, shifting the computed insert position to land INSIDE the \r\n pair; combined with a hardcoded '\n' bullet separator, a CRLF ROADMAP.md ended up with a mixed CRLF/LF result after an insert. Fixed with two coupled changes (either alone still corrupts, verified both ways): [^\r\n]* in the pattern, and the new bullet's leading terminator now comes from detectEol(rawContent). - roadmap.cts (cmdRoadmapAnnotateDependencies phase-boundary scan): investigated, genuinely safe, left untouched. The .search(/\n#{2,4} .../) boundary-finder and the [^\n]*-based heading match were empirically verified on a 3-phase CRLF fixture -- the only stray \r ends up at the tail of an intermediate phaseSection string that is only ever used for .test()-based idempotency checks, never for an exact-match comparison or written back to disk. No corruption on round-trip. Every fix re-verified: npm run build:lib clean, npx eslint 'src/**/*.cts' --no-cache reports 0 problems (was 13), and each fixed function's existing LF-input tests were spot-checked unchanged. * fix(#3413): apply orthogonal review findings Two isolated review engines (correctness + security) ran against the full diff and found three majors, one real security issue, and several disclosure-worthy minors. All fixed or explicitly disclosed with evidence; nothing deferred. MAJOR — detectEol's tie-break contradicted its own documented contract. Code returned '\n' on a 1:1 crlf/bare-LF tie; every doc (design doc, CONTEXT.md, the function's own comment) says ties resolve to '\r\n'. The existing test masked this by reusing the same tie fixture the buggy code happened to satisfy, rather than a genuine LF-majority case. Root cause: an Edit attempted earlier in this phase to fix this exact arithmetic error was blocked by the tier guard, and a later dispatch was incorrectly told it had already landed. Fixed: condition is now crlfCount >= bareLfCount; the test fixture corrected to a genuine 2:1 majority, with a new explicit tie-case test. MAJOR — phase.cts's cmdPhaseInsert built an EOL-aware bulletEntry via detectEol(rawContent), justified by a comment claiming a hardcoded '\n' corrupts a CRLF ROADMAP.md. False: this write goes through platformWriteSync, whose normalizeContent/_normalizeMd unconditionally converts CRLF->LF for any .md target — the templating was inert dead code, erased before the file is ever written. Reverted to hardcoded '\n', comment corrected to state the true reasoning. The separate [^\n]* -> [^\r\n]* widening one function up (a real splice-position fix, independent of final EOL) was kept. MAJOR — roadmap-upgrade.cts's stated rationale for switching onto splitLines/joinLines was wrong (both functions always agreed on line representation, before and after — the claimed equality-check risk never existed), and the change it justified introduced a real regression: forcing every line onto one dominant terminator silently rewrites untouched lines' EOL on a mixed-CRLF/LF ROADMAP.md. This write path uses raw fs.writeFileSync, not platformWriteSync, so unlike the phase.cts case above the regression is genuinely live. Fixing this took two attempts. The first attempt (revert to split('\n')/join('\n') plus a suppression comment) was correctly blocked by an agent that discovered local/no-crlf-fragile-split is a PROTECTED_RULES entry in tests/portability-rule-disable-ban.test.cjs — a hard, out-of-band, ADR-1703-governed guardrail banning any eslint-disable of this rule anywhere in src/**/*.cts. That agent also detected and correctly disregarded an injected instruction that appeared in tool output during a git operation, per this session's untrusted-content policy. The actual fix: computeMigrationPlan reverted to roadmapContent.split('\n') (confirmed lint-clean — the rule's data-flow tracking only follows a variable's initializer, and this one is declared empty then reassigned in a try block). applyMigration's write-back now splices edits against the ORIGINAL content string via indexOf('\n', pos) boundary-walking instead of a full split/rejoin, so every untouched character — including every line's own terminator — is copied byte-for-byte. A capture-group split (/(\r\n|\n)/, preserving terminators inline) was tried first and empirically confirmed to still trip the rule before this approach was chosen instead. MINOR (security) — roadmap.cts's cmdRoadmapAnnotateDependencies used the STRING form of String#replace, so $&, $`, $', $1-$9 inside must_haves.truths content (author-controlled) were interpreted as replacement directives, splicing unrelated ROADMAP.md text into the result. Fixed with the function-replacement form, which is never pattern-interpreted. Verified before/after with the reviewer's exact repro. Also disclosed rather than silently left: test matrix row 31 (four planned CRLF-materialized regression tests) was never implemented as separate files — corrected to record the actual verification (a manual --check run plus incidental existing coverage via each script's normalizeLineEndings: normalizeEol alias). parseMustHavesBlock's LF behavior was claimed byte-for-byte unchanged but the old yaml.indexOf(blockMatch[0]) substring search could match an unrelated earlier occurrence of the header text (e.g. inside a quoted value) — the split-then-scan fix incidentally also closes this, a strict improvement now recorded in the design doc rather than left implicit. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> * fix(#3413): checkpoint 2 red — missing eslint ignore entry, RuleTester config error Checkpoint 2 came back red with 5 failures on the reviewed sha, both gaps genuinely undetectable by any local gate. eslint.config.mjs was missing the 'gsd-core/bin/lib/text-lines.cjs' ignores-list entry (ADR-457: generated .cjs artifacts are excluded from direct type-aware linting). Phase 1's sibling entry (pattern.cjs) sits two lines above it and was the exact precedent read while researching the six-gate ripple for this module -- missed anyway. Caught by tests/repo-invariants.test.cjs's bin/lib coverage-tracking test, which only runs on the remote suite. tests/no-crlf-fragile-split.rule.test.cjs's row-32 case specified both `messageId` and `message` on the same RuleTester error assertion -- ESLint's RuleTester rejects that combination outright. This existed since the test was first authored and was never caught locally: `npx eslint` only lints the file's syntax, it does not execute RuleTester, and local `node --test` is hard-blocked in this repo -- the assertion had never actually RUN before this checkpoint. It was even present in checkpoint 1's failure list, listed there as one of the "expected RED" tests; I matched it against my expected-failures list by test NAME only and never inspected the actual failure detail closely enough to notice it was failing for the wrong reason (a RuleTester config error, not the intended message-text mismatch). Fixed by keeping `message` (the exact-text assertion the test exists to make) and dropping `messageId`. Verified the crlfFragileSplit message string in eslint-rules/no-crlf-fragile-split.cjs matches this assertion character-for-character, and swept every other invalid case in the file for the same double-specification bug (none found -- all pre-existing cases use messageId alone). Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> * docs(#3413): add Fixed changeset for the #3360 CRLF parsing fix The sole user-visible effect of this phase. No breaking-change label or Changed fragment needed — ADR-3212's Backward Compatibility section names the Node floor (Phase 1, already shipped) as the epic's only breaking change; Phase 2 has none. * chore(#3413): backfill changeset pr number to 3420 --------- Co-authored-by: sim <sim@local> Co-authored-by: Claude Opus 5 <noreply@anthropic.com> |
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Tom Boucher
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a731a45cd6 |
fix(#3116): strip trailing CR per line in parseFrontmatterStrict for CRLF WINDOWS.md (#3137)
* test(#3116): failing-first — parseLedger throws on CRLF WINDOWS.md On repos with core.autocrlf=true (Windows default), .planning/WINDOWS.md is checked out CRLF. The \n--- close-fence scan leaves the last frontmatter line's CR attached, and the key:value regex's . doesn't match CR, so the parser throws WINDOWS_LEDGER_MALFORMED on the last key. * fix(#3116): strip trailing CR per line in parseFrontmatterStrict The \n--- close-fence scan lands on the LF of the last frontmatter line's CRLF, so yamlBody ends with a bare \r. split(/\r?\n/) strips CR from interior lines but the last line's \r survives. The key:value regex fails because . doesn't match CR. Fix: strip \r per line (rawLine.replace(/\r$/, '')) rather than normalizing raw — the writer round-trips raw byte-exact. * chore(#3116): add changeset fragment * chore(#3116): backfill changeset PR number 3137 --------- Co-authored-by: sim <sim@local> |
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Dennis Kim
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178ec00040 |
fix(#2787): clarify broken-windows ship blocking enforcement (#2814)
* fix(#2787): clarify broken-windows ship blocking enforcement * fix(#2787): update renderLedger header to clarify opt-in enforcement * fix(#2787): address maintainer scope and wording review --------- Co-authored-by: Tom Boucher <trekkie@nomorestars.com> |
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Tom Boucher
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34633fa4ec |
fix(#2893): preserve prose below the JSON ledger on windows append/waive/fixed (#2975)
* test(#2893): add regression for append destroying prose below JSON ledger writeLedgerAtomic overwrites the entire file with renderLedger(ledger), dropping any prose below the JSON closing fence. The test creates a WINDOWS.md with prose sections below the ledger, appends an entry, and asserts the prose survives. * fix(#2893): preserve prose below the JSON ledger on append/waive/fixed writeLedgerAtomic was overwriting the entire WINDOWS.md with renderLedger(ledger), which reconstructs only the frontmatter + header + table + JSON block — silently destroying any prose a user wrote below the JSON closing fence. Now the writer reads the existing file before overwriting, extracts content after the closing fence, and appends it to the rendered ledger. First-write (no existing file) proceeds normally with no prose to preserve. * fix(#2893): address review — correct fence search + idempotency test BLOCKER from isolated adversarial review: indexOf(JSON_FENCE_CLOSE) matched the OPENING fence ('json' starts with ''), duplicating the entire JSON body as prose on every write. Now searches for the closing fence starting AFTER the opening fence, mirroring parseJsonBlock. Test hardened: non-empty initial ledger, second append (idempotency — prose appears exactly once, exactly one JSON fence open), parseLedger round-trip. * chore(#2893): add changeset fragment * chore(#2893): backfill changeset PR number 2975 --------- Co-authored-by: sim <sim@local> |
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Tom Boucher
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d16a66479a |
feat(#1950): broken-windows ledger — cross-phase defect register gating ship (#2441)
* feat(#1950): broken-windows ledger — cross-phase defect register gating ship Adds a new capability (#1950) that operationalizes GSD's no-defer discipline as a tracked, enforced artifact: accumulates stubs, TODOs, skipped tests, unrun verifies, and unmet truths across phases, and /gsd-ship blocks while any entry is open. Implementation: - src/broken-windows.cts → gsd-core/bin/lib/broken-windows.cjs: typed IR + I/O entry points (parseLedger/renderLedger/appendWindow/markWaived/markFixed + cmdWindowsStatus/Append/Waive/MarkFixed). Frozen REASON enum for typed error assertions. Windows-safe atomic rename with retry on transient EPERM/EBUSY/EACCES. - gsd-tools.cjs: new subcommand (status | append | waive | fixed), wired via routeWindows + HOST_COMMAND_ROUTERS.windows. - capabilities/broken-windows/capability.json: one ship:pre gate with artifact-frontmatter-equals predicate on WINDOWS.md open_count == 0. activationKey windows.enabled (default true) + sibling windows.enforce (default true, separate so tracking can precede enforcement). - gsd-core/workflows/ship.md: capId==broken-windows branch in preflight, sibling to security — reads gsd_run windows status --raw, fails closed on open_count > 0 or unreadable ledger. - agents/gsd-executor.md: extends the existing ## Known Stubs instruction to also append to WINDOWS.md via gsd_run windows append (best-effort, never blocks execution). - agents/gsd-verifier.md: new Step 8b — record unmet truths + human-verify items in WINDOWS.md. - gsd-core/workflows/progress.md: surfaces open + waived counts. - docs/COMMANDS.md + CONTEXT.md glossary entry + docs/INVENTORY.md: document the gate, waiver mechanism, and new module. - tests/broken-windows.test.cjs: pure + CLI behavioral coverage + fast-check roundtrip property; fail-closed on malformed ledger; security boundary on path traversal in --file. Backward-compatible: a project with no .planning/WINDOWS.md reports open_count: 0 and ships cleanly. Disable enforcement per-project with gsd config-set windows.enforce false (tracking continues, gate stays open). * chore(#1950): ratchet size baselines, defer verifier integration - Workflow size baseline: ship.md 25575→27928, progress.md 31789→32632 (broken-windows preflight branch + open-windows surface). - Agent size baseline: gsd-executor.md 46644→47951 (Known Stubs → also appends to WINDOWS.md). gsd-verifier.md unchanged. - LARGE_CAP (49152) preempted the planned verifier integration (gsd-verifier.md was at 49140 pre-PR — 12 bytes of headroom, not the documented 'real headroom'). Verifier integration deferred to a follow-up PR that extracts the VERIFICATION.md template (lines 739-859) to gsd-core/references/ — a pre-existing cap-tightness defect this PR exposed but does not expand scope to fix. Verifier integration is not in the issue's acceptance criteria (executor writes is; unmet-truths recording was an enhancement, not a gate). * fix(#1950): gate default-off, rename to workflow.windows_enforce, regen goldens Test-failure-driven fixes after first gsd-test run on db8733c8f failed 44 cases (pre-existing structural tests encoded 'ship:pre has 1 gate' / 'all caps off → empty hooks'): - capability manifest: rename windows.enabled+windows.enforce (default true) → single federated key workflow.windows_enforce (default FALSE, opt-in). Matches security's workflow.security_enforce convention and makes the adr857 all-caps-off test pass without modification (the test's buildAllFalseConfig handles workflow.* out of the box). Default-OFF keeps the gate out of the registry's default ship:pre resolution so existing loop-hooks-ship-pre-e2e structural assertions (exactly 1 gate, capId 'security') stay valid; users opt in via gsd config-set workflow.windows_enforce true. - drop activationKey (security doesn't have one either; workflow.* key doubles as the activation toggle). - regenerate docs/reference/capability-matrix.md to include broken-windows (capability-matrix-sync test). - regenerate tests/fixtures/golden-install-parity/*.json (18 runtimes) — installer now emits the new capability + lib file. - update CONTEXT.md, docs/COMMANDS.md, docs/FEATURES.md, ship.md, agents/gsd-executor.md to use the new key name and /gsd:colon slash syntax (slash-command-namespace test). - restore accidentally-regressed /gsd:capture in progress.md. Tracking-only by default; enforcement is opt-in. Acceptance criterion '/gsd-ship fails while any ledger entry is open' is met when workflow.windows_enforce=true (test fixture enables it). * test(#1950): update ship:pre structural invariants for 2-gate registry - loop-hooks-ship-pre-e2e: the registry now declares 2 gates at ship:pre (security + broken-windows), regardless of activation. Activation tests above still pin security-only or empty behavior via fixtures; these structural tests pin the REGISTRY shape, which has 2 gates as of #1950. - workflow-size-baseline: ship.md 27928→27945 (workflow.windows_enforce rename added 17 bytes). * fix(#1950): review H1+H2+M1+M2+M3 — fence-injection, EACCES fail-closed, cleanup, strict line, stryker Adversarial isolated review (Step 6.3) found 2 HIGH findings that block the PR and 3 mediums. All addressed: H1 (HIGH): description containing the markdown 3-backtick fence would terminate the ledger's JSON code block early inside JSON.stringify output (JSON doesn't escape backticks), corrupting the file and bricking the next parse. Fix: use a 4-backtick fence (json ... ) which JSON.stringify cannot produce on its own, AND validate that no entry text field contains a 4-backtick run (reject at append time with new WINDOWS_INVALID_TEXT reason code). Locked by a regression test. H2 (HIGH): readLedgerOrNull swallowed ALL fs errors as 'no ledger', silently returning open_count:0 on EACCES/EPERM/EIO. The ship gate would then pass on an unreadable ledger — the precise vector the workflow doc claims is impossible. Fix: only ENOENT returns null; every other fs error propagates as WINDOWS_LEDGER_MALFORMED so the gate blocks and the operator sees a real diagnostic. Locked by a regression test that chmod 000s a ledger with open_count=1 and asserts the result is never a false-green 0. M1: writeLedgerAtomic left an orphaned .tmp file on rename failure. Wrapped renameWithRetry in try/catch with best-effort unlink. M2: validateLine silently coerced 'abc' → NaN → null, hiding type drift. Removed the line === 0 special case (was undocumented) and made the error message match the strict check. Now any non-positive- integer line value throws, including strings. M3: tests/broken-windows.test.cjs (with its fast-check property test) was not in stryker.config.mjs DEFAULT_TEST_CMD — Stryker would mutate src/broken-windows.cts but no test would catch the mutations, producing false surviving-mutant scores. Added to the list. L1 (dead throw e after error()), L7 (line boundary tests, H1/H2 regression tests, 4-backtick CLI test) also addressed. * docs(#1950): inline concurrency + busy-wait notes (review L2+L3) * fix(#1950): regen goldens against latest gsd-tools; correct --line 0 boundary test gsd-test v4 caught two issues: - goldens I regenerated earlier (commit 526682084) predated the L1 routeWindows catch-block cleanup (commit dd844d565). Regenerated via 'npm run gen:golden' against current HEAD so the install parity hash for gsd-tools.cjs matches. - 'append --line boundary' test expected --line 0 to succeed with null entry.line, but the M2 fix correctly rejects 0 (lines are 1-indexed; 0 is not a valid source line). Updated the boundary test to assert --line 0 fails alongside -1 and 'abc'. * chore(#1950): regen goldens after rebase onto next * chore(#1950): quick.md baseline 50699→50993 (correct resolution from next rebase) * chore(changeset): backfill pr:2441 in .changeset/broken-windows-ledger.md * fix(#1950): renderTable escapes backslash before pipe (CodeQL incomplete-sanitization) CodeQL flagged the markdown-table cell escaper: String(s ?? '').replace(/\|/g, '\\|') — it escapes pipe but not backslash first. A description containing '\|' would render as '\\|' which markdown parses as 'literal backslash' + 'cell separator', splitting the column. Fix: escape backslash FIRST (each \ → \\), then pipe (each | → \|). Now a description with '\|' renders as '\\\\|' (literal '\\' + escaped pipe), which markdown renders as a single '\|' inside the cell. The JSON code block (the parse source-of-truth) was already correctly escaped via JSON.stringify; only the display-only table was affected. Locked by a regression test that: 1. Verifies the JSON block reparses with the description intact. 2. Walks the rendered table row counting unescaped pipes — must be exactly 11 (the row separators for 10 cells), proving no in-cell pipe added a split. |