chore(release): 1.7.19

[jackwener]

Summary

Major hotfix + simplification batch on top of v1.7.18. Extension 1.0.14.

Headline items:

• BREAKING: opencli browser user surface replaces required-flag --session <name> with <session> positional (refactor(browser): replace --session flag with <sessionname> positional #1505)
• Extension 1.0.14: pageScopedResult no longer wraps exec data with { session, data } — fixes silent NOT_FOUND on google search / xiaohongshu search and related adapters (fix(browser): drop session injection from extension exec results #1518)
• Twitter cursor pagination no longer silently caps at ~500 items; 8 adapters fixed (fix(twitter): raise cursor pagination guard #1532)
• Node floor lowered to >=20.0.0 (chore: drop util.styleText to support Node v20+ #1524)
• page.evaluate(fn, ...args) type-safe function form (feat(browser): add function form page.evaluate #1508)

Smaller items in CHANGELOG.

Test plan

• CHANGELOG entry consolidates all PRs since v1.7.18 (4 BREAKING + 6 Features + 13 Bug Fixes + 4 Internal)
• package.json version 1.7.18 → 1.7.19
• Extension 1.0.14 referenced in CHANGELOG
• Admin merge (per WAWQAQ "不等 CI" pattern for release commits)
• Push tag v1.7.19 to trigger Release workflow