chore(#3331): fix stale CONTEXT.md predicates left by the no-elapsed-assertion promotion

Standards-axis code review caught 3 stale predicates (CONTEXT.md:470,
536, 541) still describing local/no-elapsed-assertion as warn and
citing the superseded epic #1885 (subsumed into #3053 and closed
stale). Regenerated the derived CONTEXT-INDEX.json snapshots.

CONTEXT.md

@@ -467,7 +467,7 @@ A test that generates many adversarial inputs automatically (via `fast-check`) a
 Stryker injects small code mutations (e.g., flipping a `>` to `>=`, deleting a `return` statement) and reruns the test suite for each. A mutation is "killed" if at least one test fails; "surviving" if all tests pass despite the mutation. Mutation score = killed / total. Score below 80 % on the changed scope blocks PR merge. See `RULESET.TESTS.mutation-score`.
 
 ### ESLint harness
-The canonical lint infrastructure adopted in ADR 452 (`docs/adr/452-eslint-lint-harness.md`): ESLint flat config (`eslint.config.mjs`) with `typescript-eslint`, `eslint-plugin-n`, `eslint-plugin-no-only-tests`, and a local AST-rule plugin at `eslint-rules/`. Replaces the homegrown `scripts/lint-*.cjs` regex scanners. The three custom test-rigor rules (`local/no-source-grep`, `local/no-magic-sleep-in-tests`, `local/no-elapsed-assertion`) initially ship at `warn`; they become `error` after the cleanup sweep tracked at issue #453 merges.
+The canonical lint infrastructure adopted in ADR 452 (`docs/adr/452-eslint-lint-harness.md`): ESLint flat config (`eslint.config.mjs`) with `typescript-eslint`, `eslint-plugin-n`, `eslint-plugin-no-only-tests`, and a local AST-rule plugin at `eslint-rules/`. Replaces the homegrown `scripts/lint-*.cjs` regex scanners. All three custom test-rigor rules (`local/no-source-grep`, `local/no-magic-sleep-in-tests`, `local/no-elapsed-assertion`) now ship at `error` (promoted by #3313 and #3331 respectively, superseding the original #453 cleanup-sweep handoff).
 
 ### External-job-waiting half-state
 A legal deferred state of an Execute step (`external_job_waiting`): the executor has dispatched a long-running async external job and committed an async-job manifest at `.planning/async-jobs/<job>.json` instead of a SUMMARY.md. Distinct from the synchronous "mid-production-commits" half-state and from an illegal partial-plan state. The core loop's step-completion + safe-resume/pause contract treats a non-terminal manifest as legal and reconciles against it (never re-dispatching the plan, which would duplicate the external job); SUMMARY.md is deferred until the job reaches a terminal state and its `expected_artifacts` are verified. The manifest is a versioned stability contract (`docs/reference/planning-artifacts.md`); core *consumes* it while a default-off scheduler-adapter Capability (#1164) *produces* it at `execute:wave:post` — the contract-is-core / producer-is-capability seam mirrors ADR-857's verification-substrate decision. Status enum is closed and scheduler-agnostic: `submitted`, `running`, `completed-unverified`, `failed`, `cancelled`, `timeout`.
@@ -533,12 +533,12 @@ The prompt-level data/instruction isolation seam for untrusted web/document ingr
 `RULESET.TESTS.boundary-coverage.anti-pattern=test suites that pair budget:1_000_000 (trivially fits) with budget:1 (trivially overflows) and skip the boundary region; failure mode that shipped PR #3708 UNNEEDED_TRIM + FALSE_HARDFAIL regressions (commit 2df566ed, fixed bde1ae8f)`
 `LEARNING.prompt-budget.boundary-gap=PR #3708 commit 2df566ed reserved NOTE_RESERVE_TOKENS in pressure-threshold AND in minSet pre-check; both buggy paths only fire when baseTokens ∈ (effectiveBudget - NOTE_RESERVE_TOKENS, effectiveBudget]; original test suite used budgets far from that band so neither path was exercised; fix bde1ae8f confines NOTE_RESERVE accounting to post-trim assembly path only; future budget/limit code MUST add boundary fixtures per RULESET.TESTS.boundary-coverage.fixtures`
 
-`RULESET.TESTS.no-timing-assertion=do not assert on wall-clock elapsed time (Date.now() delta, performance.now(), process.hrtime() comparison); such assertions test the host machine not the SUT and flake on loaded CI runners; enforcement: local/no-elapsed-assertion ESLint rule, currently warn (promotion to error tracked under open epic #1885, not #453 which already merged without completing it); canonical replacement: clock-seam pattern with node:test mock.timers`
+`RULESET.TESTS.no-timing-assertion=do not assert on wall-clock elapsed time (Date.now() delta, performance.now(), process.hrtime() comparison); such assertions test the host machine not the SUT and flake on loaded CI runners; enforcement: local/no-elapsed-assertion ESLint rule, error (promoted by #3331 once #3314 delivered the ADR-456 §(a) reachability rule + deterministic backfill precondition); canonical replacement: clock-seam pattern with node:test mock.timers`
 `RULESET.TESTS.clock-seam=concurrency logic must accept an optional {clock=Date} parameter; tests control time via t.mock.timers.enable(['Date']) + t.mock.timers.setTime(0) + t.mock.timers.tick(N); real OS scheduler races are not a permitted test pattern after ADR 456 (2026-05-28); real-race tests are deleted once deterministic seam tests cover the same logical path; clock.cjs realClock adds nowIso() (→ new Date(this.now()).toISOString()) and today() (→ nowIso().split('T')[0]) so all date-stamping in state.cjs routes through the seam; subprocess time-pin adapter: set GSD_TEST_MODE=1 + GSD_NOW_MS=<epoch-ms> in runGsdTools env to pin the date written by the SUT without touching real wall-clock (issue #474)`
 `RULESET.TESTS.property-based-testing=modules implementing parsing / transformation / budget-limit / bijective contracts must include at least one fast-check (fc) property test asserting a domain invariant; invariant categories: round-trip, monotonicity, boundary-containment, idempotency; property tests live in *.test.cjs alongside unit tests; CI signal: Stryker mutation score below 80% blocks merge`
 `RULESET.TESTS.mutation-score=Stryker runs incremental (--since origin/next) on ubuntu-latest/Node24 CI leg; default threshold 80% killed/total; surviving mutants in scope block merge unless path is listed in stryker.config.mjs with documented reason; treat surviving mutant as a failing test specification`
 `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 eslint-rules/ (repo root, NOT scripts/eslint-rules/); replaces scripts/lint-*.cjs regex scanners (fully removed in #632); of the three test-rigor rules, local/no-source-grep and local/no-magic-sleep-in-tests are already promoted to error in tests/**/*.test.cjs scope (post-cleanup), local/no-elapsed-assertion remains at warn pending open epic #1885 (its dedicated ratchet issue #453 already merged without completing this promotion; follow-up #1888 was closed not-planned and folded into #1885)`
+`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 eslint-rules/ (repo root, NOT scripts/eslint-rules/); replaces scripts/lint-*.cjs regex scanners (fully removed in #632); all three test-rigor rules now ship at error in tests/**/*.test.cjs scope: local/no-source-grep and local/no-magic-sleep-in-tests promoted by #3313, local/no-elapsed-assertion promoted by #3331 once #3314 delivered its ADR-456 §(a) precondition (epic #1885 was subsumed into epic #3053 and closed stale before this promotion landed)`
 
 `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`
 

docs/CONTEXT-INDEX.json

@@ -1082,7 +1082,7 @@
     {
       "id": "RULESET.TESTS.eslint-harness",
       "klass": "RULESET",
-      "value": "ADR 452 (2026-05-28): ESLint flat config + typescript-eslint + eslint-plugin-n + eslint-plugin-no-only-tests + local plugin at eslint-rules/ (repo root, NOT scripts/eslint-rules/); replaces scripts/lint-*.cjs regex scanners (fully removed in #632); of the three test-rigor rules, local/no-source-grep and local/no-magic-sleep-in-tests are already promoted to error in tests/**/*.test.cjs scope (post-cleanup), local/no-elapsed-assertion remains at warn pending open epic #1885 (its dedicated ratchet issue #453 already merged without completing this promotion; follow-up #1888 was closed not-planned and folded into #1885)"
+      "value": "ADR 452 (2026-05-28): ESLint flat config + typescript-eslint + eslint-plugin-n + eslint-plugin-no-only-tests + local plugin at eslint-rules/ (repo root, NOT scripts/eslint-rules/); replaces scripts/lint-*.cjs regex scanners (fully removed in #632); all three test-rigor rules now ship at error in tests/**/*.test.cjs scope: local/no-source-grep and local/no-magic-sleep-in-tests promoted by #3313, local/no-elapsed-assertion promoted by #3331 once #3314 delivered its ADR-456 §(a) precondition (epic #1885 was subsumed into epic #3053 and closed stale before this promotion landed)"
     },
     {
       "id": "RULESET.TESTS.feedback-loop-convergence",
@@ -1132,7 +1132,7 @@
     {
       "id": "RULESET.TESTS.no-timing-assertion",
       "klass": "RULESET",
-      "value": "do not assert on wall-clock elapsed time (Date.now() delta, performance.now(), process.hrtime() comparison); such assertions test the host machine not the SUT and flake on loaded CI runners; enforcement: local/no-elapsed-assertion ESLint rule, currently warn (promotion to error tracked under open epic #1885, not #453 which already merged without completing it); canonical replacement: clock-seam pattern with node:test mock.timers"
+      "value": "do not assert on wall-clock elapsed time (Date.now() delta, performance.now(), process.hrtime() comparison); such assertions test the host machine not the SUT and flake on loaded CI runners; enforcement: local/no-elapsed-assertion ESLint rule, error (promoted by #3331 once #3314 delivered the ADR-456 §(a) reachability rule + deterministic backfill precondition); canonical replacement: clock-seam pattern with node:test mock.timers"
     },
     {
       "id": "RULESET.TESTS.property-based-testing",