test: add Writer 0.9.0 coverage gaps

[Digidai]

Summary

• add focused node:test coverage for archive restore/reopen edge cases in src/archive-actions.js
• add helper-level coverage for semantic, search, reader escaping, and cron janitor behavior
• extend persist/export tests for formatting guardrails and 413 row-cap handling
• bump version metadata to 0.9.0 (package.json, package-lock.json, src/version.js, CHANGELOG.md)

Test Areas Added

• archive-actions restore vector lifecycle + reopen 409 guards
• semantic helpers: feature gating, payload vector extraction, delete fallback, legacy D1 backfill fallback
• search helpers: escapeLike, ordered hydration, strict mode parsing, no-key semantic request behavior
• html reader output escaping for metadata + http(s)-only markdown links
• cron janitor behavior when idle draft archive is disabled + launchPipeline guard no-op
• persist formatting safeguards (agentFormatting === false, short formatted output fallback)
• export 413 when archived rows exceed the 200-document cap

Validation

• npm test ✅
• npm run check ✅

  

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