Add feature request doc: OpenBrain Playwright fallback retrieval

[Copilot]

JS-heavy pages silently ingest empty content via OpenBrain's current fast-HTML extractor. This adds the PM/Engineering handoff document specifying a Playwright-based fallback — scoped to SourceBase's documentation responsibility only; implementation lives in the OpenBrain repo.

New file: docs/feature-requests/openbrain-playwright-fallback-retrieval.md

• Problem & users — three user stories: Discord community operators, automation authors running ob add, OpenBrain engineers implementing the fallback
• Technical acceptance criteria — 8 criteria: same extractor interface, opt-in config flag (ingestion.playwrightFallback / OB_PLAYWRIGHT_FALLBACK=1), content-length trigger threshold, pipeline compatibility, graceful degradation, no credential persistence, explicit timeout, structured telemetry emission
• CI/test strategy — tiered: record/playback HTTP fixtures as default (stored in test/fixtures/playwright-fallback/), module-level stub option, real-browser integration test gated behind OB_PLAYWRIGHT_INTEGRATION=1 on self-hosted runners only
• Telemetry — 8 non-sensitive metadata fields (event, triggered, primaryContentLength, fallbackContentLength, durationMs, success, errorType, provider); no URLs, content, or secrets
• Implementation sketch — proposed file layout under src/lib/ingestion/ and orchestration pattern in service.ts
• All required cross-references — OB-0MN9HWGAL001452N, OB-0MNFXR3E4005TGYX, src/cli/commands/add.ts, src/lib/ingestion/service.ts, src/lib/ingestion/extractor.ts

Work item OB-0MNHT5HTC0070EL7 stage updated to intake_complete in local worklog (GitHub issue #5 label sync requires valid gh credentials; run wl github push --id WL-0MNKVEU80005T0O1 to complete).

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