feat(fleet): add local canary CLI (#563)

docs/scratchpads/2026-06-20-fleet-cli-local-canary.md

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+# Fleet CLI Local Canary Dogfood — 2026-06-20
+
+## Objective
+
+Move the durable tmux fleet PoC into a functional local canary on this server. This is **not** production deployment. It is a canary/dogfood path for a small local agent fleet using an isolated tmux socket.
+
+## Issue
+
+- Gitea issue: #562 — `feat(fleet): local CLI canary dogfood`
+
+## Scope
+
+Implement enough product surface to use the fleet locally:
+
+- `mosaic fleet init/install/start/stop/restart/status/verify`
+- `mosaic agent roster/status/send/reset/tail`
+- roster schema and examples
+- local canary docs and rollback instructions
+- tests for CLI behavior where practical
+- canary verification on named tmux socket `mosaic-factory`
+
+## Non-goals
+
+- No production rollout.
+- No migration of existing default tmux sessions.
+- No image build/deploy work.
+- No hardcoded USC/local roster as product default.
+
+## Acceptance Criteria
+
+- CLI can initialize a minimal roster outside product defaults.
+- CLI can install user systemd units and fleet helper scripts to a configurable Mosaic home.
+- CLI can start/stop/status/verify a canary fleet using `mosaic-factory`.
+- `mosaic agent send` uses existing named-socket/exact-target tmux tooling.
+- `mosaic agent reset` targets only the named agent session on the named socket.
+- Verification proves default tmux sessions remain untouched.
+- Baseline repo gates pass.
+- PR CI is green before merge.
+- Local canary evidence is captured after merge/install.
+
+## Budget / Routing
+
+- Agent: codex preferred.
+- Estimate: 25K-40K tokens.
+- Worker owns implementation/tests/docs in branch `feat/fleet-cli-local-canary`.
+- Orchestrator owns `docs/TASKS.md`, issue/PR/merge, and local canary install verification.
+
+## Progress
+
+- 2026-06-20: #557 PoC primitives merged to `main` as `45e2c2a`.
+- 2026-06-20: issue #562 created for local CLI canary dogfood.
+- 2026-06-20: worktree created at `/home/jarvis/src/mosaicstack-stack-worktrees/fleet-cli-local-canary`.