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

packages/mosaic/framework/fleet/README.md

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+# Mosaic Fleet Rosters
+
+The local fleet canary uses a product-owned roster schema with site-owned roster
+files. Product examples live here; active local rosters should live outside the
+package, normally at:
+
+```text
+~/.config/mosaic/fleet/roster.yaml
+```
+
+The default tmux socket is `mosaic-factory` so fleet commands do not touch the
+default tmux server.
+
+## Examples
+
+- `examples/minimal.yaml` starts one local canary slot.
+- `examples/local-canary.yaml` starts a small generic dogfood fleet.
+
+Initialize a roster:
+
+```bash
+mosaic fleet init --profile minimal --write
+mosaic fleet install-systemd
+mosaic fleet start
+mosaic fleet verify
+```