Fix issue detail and agent operational lifecycle

[Codename-11]

What changed

• streamlined the issue-detail right rail into the page's single scroll owner and made Activity the default tab
• preserved patient waiting runs without repeated stall replies and made command-center reply cards expandable
• guaranteed exactly one durable final issue comment for every successful agent run across all engagement modes
• fenced late provider trace events after terminal completion and cleared live-only run state
• routed GitHub issue and pull-request URLs through Forge's native GitHub relation instead of opaque attachments
• unified operational alert lifecycle in NotificationState, including durable recovery reconciliation
• improved Command Center incident grouping, exact counts, destructive confirmations, error states, and notification-drawer accessibility
• restored remove/reorder support for migration-era pin_<md5> rows and added direct per-item navbar unpin controls

Why

AXI-102 and AXI-103 exposed several related lifecycle and presentation gaps: patient waits could generate repeated status noise, completed runs could remain visually stuck on a late thinking trace without replying in the issue thread, GitHub PRs could be attached outside the native integration, and read alerts could remain stale after the underlying condition recovered. AXI-28 also exposed a persisted-ID compatibility gap: migration 0023 intentionally created pin_<md5> IDs while the router only accepted CUIDs.

Impact

Operators get a calmer issue view, truthful terminal run state, visible agent outcomes, native GitHub context, one shared alert/notification lifecycle across the drawer and operational surfaces, and reliable unpinning for both historical and new pins.

Validation

• pnpm lint (passes with existing repository warnings)
• pnpm typecheck
• 156 focused database tests, including real-database legacy pin remove/reorder coverage
• full Vitest run: 1,212 passed, 1 skipped; known cross-suite stale-work race passed independently (9/9)
• fresh production build
• focused Playwright: Command Center layout, issue flow, notification drawer focus containment/restore (3/3)