docs: correct the SQLite migration count (182 -> 183) breaking every PR's docs gate

[gonisulaimann]

The strict docs-accuracy gate ("Docs accuracy — fabricated-docs + i18n mirrors, strict") is failing on every PR with three drift errors since the merge wave landed migration #183:

✗ README.md — stale migrations: "182 migrations" — code has 183
✗ AGENTS.md — stale migrations: "182 migrations" — code has 183
✗ llm.txt — stale migrations: "182 migrations", "182 versioned SQL migration", "182 SQL migrations" — code has 183

Example run: https://github.com/diegosouzapw/OmniRoute/actions/runs/35945840872 (tracked under the base-red issue #14547, alongside the env-doc drift that #14683 fixes).

What changed

• README.md, AGENTS.md, llm.txt: 182 → 183 migrations (5 phrasings in llm.txt).
• Re-propagated the 66 docs/i18n/<locale>/llm.txt strict mirrors via scripts/i18n/sync-llm-mirrors.mjs.
• Changelog fragment per convention.

Verification

• npm run check:docs-sync — PASS (66 locales in lock-step).
• npm run check:docs-all — the migration drifts are gone; the only remaining failure in the family is the env-doc one (DEEP_HEALTH_CHECK_ENABLED), which [dup] fix(quality): restore release typechecks and env-doc sync #14683 owns.

⚠️ base-red inherited: #14547 (typecheck/unit failures unrelated to this docs fix).

[diegosouzapw]

Thanks @gonisulaimann — exactly the right diagnosis. The same 182 → 183 migration-count sync (README, AGENTS.md, llm.txt and the 66 mirrors) landed a few minutes earlier as #14714, so the docs gate is already green on the tip. Closing as a duplicate. (merge-batch 2026-09-24)