refactor(fleet): rename tmux socket mosaic-factory → mosaic-fleet (#630)

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

docs/scratchpads/fleet-observability-phase2.md

@@ -31,7 +31,7 @@ with a second agent on `dragon-lin`.
 ## Environment facts (verified 2026-06-20)
 
 - Fleet is live on `W-jarvis` (uid 1000, `jarvis`, `Linger=yes`) on tmux socket
-  `mosaic-factory`: `_holder`, `canary-pi`, `dogfood-coder`, `dogfood-orchestrator`,
+  `mosaic-fleet`: `_holder`, `canary-pi`, `dogfood-coder`, `dogfood-orchestrator`,
   `dogfood-reviewer`. All panes run `~/.config/mosaic/fleet/dogfood-agent.py` (stub),
   including `canary-pi` (roster says runtime=pi → **drift**).
 - Holder + `mosaic-agent@*` units are `active (exited)` but `UnitFileState=disabled`
@@ -56,7 +56,7 @@ with a second agent on `dragon-lin`.
   with dragon-lin coder, commit docs, begin Phase-2 delivery (heartbeat + `fleet ps`).
 - 2026-06-20 (session 2): Built Phase-2 CLI via worker (commit ab47831): `fleet ps`,
   `agent watch`, `agent send --verify`, 62 tests. LIVE-verified `fleet ps` on
-  mosaic-factory — correctly flagged canary-pi DRIFT + BOOT-ENABLE, tenant_id+host in JSON.
+  mosaic-fleet — correctly flagged canary-pi DRIFT + BOOT-ENABLE, tenant_id+host in JSON.
   Heartbeat responder added to dogfood-agent.py (FLEET-OBS-002) — `fleet ps` HB now
   `healthy` for all 4 agents.
 - Coordination: dual-engine-reviewed (Claude+Codex) and merged framework PRs #572