feat(linkedin): add timeline feed command

[piotryordanov]

Summary

• add a new linkedin timeline browser adapter to read posts from the LinkedIn home feed
• extract author profile URLs, best-effort post URLs, timestamps, and engagement counts from feed cards
• document the new command in the LinkedIn adapter docs and adapter index

[jackwener]

Review Summary

Good work on this PR. The LinkedIn timeline adapter is well-structured with solid deduplication logic, login wall detection, and robust DOM parsing across multiple LinkedIn feed card layouts.

What I pushed

1. Added test file (src/clis/linkedin/timeline.test.ts) — 10 tests covering:

   • Command shape registration (site, name, domain, strategy, browser flag)
   • Arg defaults (limit=20)
   • Column definitions
   • parseMetric utility (plain numbers, k/m suffixes, edge cases)
   • buildPostId (url-first fallback to composite key)
   • mergeTimelinePosts deduplication and filtering

2. Updated vitest config to include src/clis/linkedin/**/*.test.ts in the adapter test project.

Validation

• Typecheck: ✅ passes
• All 242 tests pass (22 files, including the new timeline tests)
• Rebased cleanly onto latest origin/main

Notes

• normalizeWhitespace is duplicated from search.ts — could be extracted to a shared util in a future cleanup, but not blocking.
• The __test__ export is a good pattern for exposing internals to tests.

LGTM — merging after CI is green.

[piotryordanov]

Lol @jackwener i had manually removed that file before the push

What are you using to automate the PA merge? This is clearly vibe reviewed