feat(linkedin): export profile activity posts

[gauravsaxena1997]

What and why

LinkedIn profile activity posts are useful for career and content workflows, but OpenCLI does not currently provide a read-only way to export the visible post body and counters from an authenticated profile activity page.

This PR adds a raw posts export command. It intentionally avoids custom scoring or classification and returns only data visible in the LinkedIn browser session.

What this PR does

Adds a Strategy.COOKIE LinkedIn browser adapter:

opencli linkedin posts --limit 1 -f json

Implementation details:

• Adds shared LinkedIn helpers for auth-wall checks, safe URL validation, limit parsing, text normalization, and evaluate-result unwrapping
• Adds posts-core.js for DOM extraction helpers without registering an extra command
• Extracts visible post author, posted age, expanded body text, reactions, comments, reposts, impressions when LinkedIn exposes them, media labels, media URLs when non-decorative media URLs are visible, post URL when LinkedIn exposes it, and raw card text
• Filters out decorative/profile/reaction image URLs so media_urls does not incorrectly return avatar or reaction CDN assets
• Supports --limit from 1 to 100

Live verification

Verified against a logged-in LinkedIn profile session:

opencli linkedin posts --limit 1 -f json

Returned the latest visible post with author, full body, reaction count, comment count, repost count, visible impressions, media label, and raw card text. On that card LinkedIn exposed a media label but not a real post-media URL, so media_urls correctly returned an empty string instead of a profile-photo URL.

Checklist

• npm run build
• npx vitest run --project adapter clis/linkedin/posts.test.js
• npm run typecheck
• node scripts/check-typed-error-lint.mjs
• node scripts/check-silent-column-drop.mjs

[jackwener]

Closed as superseded by consolidated PR #1731, merged as b6965a5.

[jackwener]

Superseded by consolidated PR #1731 (merged as b6965a5).