docs(context): add RULESET.AUDIT.search-source-not-generated (#1128)

Codify the audit search-discipline rule surfaced by the ADR-857 phase 1-5 review: verify whether an invariant/validation EXISTS by searching the AUTHORED source (src/*.cts or the scripts/gen-*.cjs generator), not the generated gsd-core/bin/lib/*.cjs artifact (gitignored per ADR-457). A generator's gen-time validation lives in the gen-*.cjs script, not the declaration it consumes; search both before declaring an invariant absent.

Prevents the false-negative that reported ADR-1016 5e's ConverterName enum as unenforced when VALID_CONVERTER_NAMES lives + is checked in gen-capability-registry.cjs.

Closes #1127

Refs #857

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

CONTEXT.md

@@ -275,6 +275,8 @@ The canonical lint infrastructure adopted in ADR 452 (`docs/adr/452-eslint-lint-
 `RULESET.TESTS.delete-bad-tests=pass-always / vacuous-truth / source-grep / elapsed-time / real-race / permanent-allow-test-rule tests are DELETED and replaced with compliant tests in the same PR; not skipped, not commented out, not permanently exempted; replacement must cover the same logical path via typed-surface assertion or clock-seam pattern`
 `RULESET.TESTS.eslint-harness=ADR 452 (2026-05-28): ESLint flat config + typescript-eslint + eslint-plugin-n + eslint-plugin-no-only-tests + local plugin at scripts/eslint-rules/; replaces scripts/lint-*.cjs regex scanners; three test-rigor rules (local/no-source-grep, local/no-magic-sleep-in-tests, local/no-elapsed-assertion) ship at warn, promoted to error after #453 cleanup sweep merges`
 
+`RULESET.AUDIT.search-source-not-generated=verify an invariant/validation EXISTS by searching the AUTHORED source (src/*.cts OR the scripts/gen-*.cjs generator), never the generated bin/lib/*.cjs (gitignored, ADR-457); gen-time checks live in gen-*.cjs not the .cts it consumes → search BOTH before declaring absent; read generated .cjs only for output drift. Repro: grep src/*.cts for VALID_CONVERTER_NAMES → false "5e ConverterName unenforced"; actually enforced in gen-capability-registry.cjs. cf RULESET.TESTS.no-source-grep`
+
 `RULESET.WORKFLOW_MARKDOWN.FENCES=preserve opening language fence when editing shell snippets in workflow markdown; malformed fence creates fresh CR threads (MD040)`
 `RULESET.WORKFLOW_SIZE_BUDGET=workflow size enforcement (#1074; BYTES not lines per #717; LF-normalized per #683) = per-file baseline (PRIMARY anti-creep: tests/workflow-size-baseline.json pins each file's exact size) + loose tier hard caps (outer red lines, NEVER raised on approach: XL<=98304 / LARGE<=61440 / DEFAULT<=40960) + new-file cap (un-baselined files <32768, the Codex anchor) + discuss-phase<32000; a file that grew fails the baseline guard — fix with `npm run size:baseline`, commit the one-line diff, and justify the growth in the PR (or extract LAZILY-loaded content; eager @-imports don't reduce loaded context); crossing a hard cap means EXTRACT, not bump`
 `RULESET.AGENT_SIZE_BUDGET=agent-size-budget (#1074; sibling of WORKFLOW_SIZE_BUDGET; BYTES not lines per #717/#683, rebased from lines in PR 3/3) = per-file baseline (PRIMARY anti-creep: tests/agent-size-baseline.json pins each agents/gsd-*.md exact byte size) + loose tier hard caps (red lines, never raised on approach: XL<=57344 / LARGE<=49152 / DEFAULT<=24576); net-new agents are DEFAULT-tier (no separate new-file cap). One 'npm run size:baseline' regenerates BOTH workflow and agent baselines via the shared scripts/workflow-size.cjs measureMdFiles(dir,predicate) counter. A grown agent fails the baseline guard — regenerate + justify, or extract LAZILY to gsd-core/references/. DISTINCT from DEFECT.AGENT-FILE-SIZE-CAP-BREACH (a separate 45K-CHAR extraction-evidence threshold on gsd-planner via planner-decomposition/reachability tests): that guard proves mode-sections were extracted; this one bounds total agent bytes. Two guards, two units (chars vs bytes), two purposes`