docs: rewrite README with Desktop plugin vs CLI standalone use cases

fix(context-health): smarter ⚠️/❌ outside a project directory; bump v2.4.1

fix: code review — injection safety, duplicate hooks, offset bugs, atomicity

fix(plugin): add chmod hook at SessionStart and rewrite context-health for plugin mode

chore: add marketplace.json for local plugin install

feat: package as Claude Code plugin

feat(morning-brief): auto-generate daily brief on first session start

docs: rewrite README with complete feature reference and how-to-use guide

fix: apply code review fixes for injection safety, regex coverage, and robustness

chore(context): sync from CON1282-Shibi — initial setup [2026-04-04T04:40:07Z]

feat(morning-brief): auto-extend to 5-day window when stories are scarce

feat(morning-brief): daily AI news digest from RSS feeds

chore(context): sync from CON1282-Shibi — initial setup [2026-04-04T04:21:22Z]

chore(context): sync from CON1282-Shibi — initial setup [2026-04-04T04:20:03Z]

feat(statusline): v2.4 — pure bash+jq statusline, enforce LF via .gitattributes, remove PS1/launcher