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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[aarontrowbridge]

Superseded by design — recorded per spec spec-20260905-193000-local-shell-data-plane rev 2, D4 (this PR is never merged; the native view retires the interim).

This draft implemented #779's read-only Fleet Sessions tree view. At the local-shell data plane's landing (Slice C, amicissimo#393), the native session list carries the merged projection (D2): both stores in one provenance-tagged list, posture-honest (the hub-down pointer surfaced, refetch-before-first-render on transitions). The sub-spec's D4 is determinative: the bridge's premise — the store split visible on today's posture, bridged without fork changes — is genuinely superseded, because the native list now carries both stores on every posture.

• The supersession is recorded on Read-only Fleet Sessions view: list hub sessions from a standalone client #779: Read-only Fleet Sessions view: list hub sessions from a standalone client #779 (comment)
• The superseding implementation: The native merged sessions view — Slice C of the local-shell data plane (amicissimo#393) #848 (amicissimo#393 Slice C).

Per the slice contract, the close stays Aaron's click — recorded superseded-by-design, never merged.

[aarontrowbridge]

Closed per D4 of spec-20260905-193000 (the local-shell data plane): the native merged sessions view has LANDED — amicode#848 + amicissimo#397 (merged 2026-09-07) render the /amicode/fleet/sessions provenance-tagged projection with posture-honest states. This held draft (the read-only Fleet Sessions tree view) is superseded-by-design, never merged — exactly the disposition the sub-spec and the synthesis campaign recorded. (Aaron's directive, 2026-09-07.)