chore(contracts): CHAOS-5672 Re-derive the ACR contract mirror for the semantic reading disclosure

[chrisgeo]

Ticket: CHAOS-5672

TEST-EVIDENCE

Re-derives the ACR contract mirror so this workbench accepts, and renders, the optional semantic_reading disclosure the producer now serves. ACR sets it on a result-by-id read of a stored clarification whose check against its stored reading of the question could not run, because that reading could not be loaded. status is unavailable, and reason is semantic_state_absent or semantic_state_unreadable. On the prior pin the result schema is closed, so a by-id response carrying the field is a contract violation.

Branch chore/5672-semantic-reading-mirror on main e7f27cb, which carries the organization-scope mirror at ACR 74d8fc4c (tip b20e9ca2c18341dc8b548a86fabd839059e9bd70, signed). Every command below ran in this worktree after a real pnpm install --frozen-lockfile.

• Mirrored-surface delta, measured. git diff --numstat 74d8fc4c 9e35fe94 over the ten mirrored ACR files:

24	0	contracts/jsonschema/v1/context_fabric_investigation_result.v1.schema.json

Only the result v1 schema changes: the one optional property.

• Pin. SOURCE_COMMIT is ACR 9e35fe9405d70879ed41600f3e4f484aea6411b2, the producer change's squash commit on ACR main.
• Sync. node scripts/sync-acr-contracts.mjs generate --allow-write --source <acr worktree parked on 9e35fe94> rc=0. check --source <that worktree> and check both print ACR contracts are current.
• Quality steps, each binary's own exit code:

generate rc=0
sync-check rc=0
sync-check-source rc=0
tsc rc=0
eslint rc=0
prettier rc=0
vitest rc=0
corpus rc=0
next-build rc=0

• vitest run:

      Tests  949 passed (949)
   Start at  20:01:29
   Duration  12.59s (transform 25.71s, setup 14.97s, import 43.51s, tests 38.81s, environment 65.76s)

• next build tail:

○  (Static)   prerendered as static content
ƒ  (Dynamic)  server-rendered on demand

Consumer pin. The new describe block in src/lib/acr/validate.test.ts checks:

• both reasons validate at this pin;
• a result without the field still validates;
• the object stays closed: a wrong status, a wrong reason (including pre_semantic_state), a missing member, an extra key and a non-object are each rejected;
• an executed repro deletes the property from a copy of this pin's own schema and shows that copy rejecting the disclosure, while it still accepts a document without it.

Rendering. SemanticReadingNotice renders a visible note in the clarification view when the field is present, with a reason-specific cause: the options could not be checked, and asking again starts a fresh investigation. DeterministicAnswerView.test.tsx asserts the note's visible text for each reason, and no note when the field is absent.

RISK-NOTES

• Wording is the workbench's own. ACR sends a closed machine token here, not a sentence, so the note's prose is authored in this repo.
• Pin is the producer's merge commit. The mirrored delta was measured against it, not against a branch tip that could still move.
• Merge order. The organization-scope mirror and the producer change are both on their mains; this branch is the last of the four.

[linear-code]

CHAOS-5672