v0.2.0 — X Bookmarks as an Agent Inbox

First public release of bookmark-digest v2.\n\nHighlights:\n- Turn X Bookmarks into a receipt-gated agent inbox.\n- Fail-closed X collection through a logged-in local Chrome/Chromium CDP session.\n- Durable accepted receipts + HMAC-bound processed state before mutation.\n- Exact-tweet unbookmark with fresh detail-page verification.\n- Scheduler-safe consumer hook and optional macOS launchd installer.\n- Mutation is off by default; the example consumer accepts nothing.\n\nVerified before release: 23/23 tests PASS, open-source security preflight PASS, independent Codex review Blockers=0 / GO.