Read-only Fleet Sessions tree view (#779)

[aarontrowbridge]

Closes #779.

What

A Fleet Sessions tree view (extension-side, shown only on fleet-client machines) that lists the canonical hub's sessions — title + last-updated — fetched read-only from the hub's session-list API over the tunnel (limit 200, directory-scoped, roots only). Clicking an entry reattaches the panel to the hub with that session pinned. When the hub is unreachable the view shows an explicit "Sessions live on " row — never a misleading empty list.

Why now

The store split bit repeatedly today (2026-09-04): fleet mode hides local sessions, standalone hides hub ones, and there's no bridge. #792's thin client supersedes this long-term, but it needs fork work; this is the deliberately minimal bridge — zero fork changes, zero app changes.

Gates (director-run)

• pnpm --filter amicode test: 2193 passed / 30 skipped / 0 failed (own run, after staging launcher bins)
• tsc --noEmit: clean
• Read-only verified by test: recorded HTTP calls are all GET; no mutation menus contributed.

Notes

• Visible only when fleet.json role=client (context key amicode.fleetClient); absent on standalone machines.
• Refresh on view open + hub attach/regain transitions; no timer.
• WIP-hold posture: stays a draft per Aaron's 2026-09-04 no-merges-while-UI-churns call.

Part of the 2026-09-03 handoff bundle (B of E); provenance: vault sessions/session-20260903-fleet-improvements-brainstorm.md §6.

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