fix(install): preserve user fleet data on re-seed + refresh active units (#631)

CRITICAL data-loss in the routine update path. `mosaic update` auto-runs
install.sh keep-mode sync (#610); the rsync --delete honored PRESERVE_PATHS but
fleet/ was not listed, so the sync WIPED ~/.config/mosaic/fleet/roster.yaml (and
fleet/run, fleet/agents). Any user running `mosaic update` lost their fleet.

PRIMARY (data-loss):
- install.sh PRESERVE_PATHS += fleet/*.yaml, fleet/agents, fleet/run. The
  framework still SEEDS fleet/examples + fleet/roles + fleet/roster.schema.json
  (synced); the operator's roster, custom rosters, per-agent env, and heartbeat
  run dir are preserved.
- Made the cp (no-rsync) fallback GLOB-AWARE so fleet/*.yaml is preserved there
  too; fixed the restore to re-glob per pattern (restores only the user file,
  not the freshly-synced fleet/ dir).
- file-adapter.ts (TS installer): mirrored the preserve list for dual-installer
  parity. (syncDirectory is copy-only — never --delete — so it never had the
  bug; this is parity + belt-and-suspenders.)

SECONDARY (stale active units):
- refreshActiveFleetUnits(): the re-seed updates ~/.config/mosaic/systemd/user
  but systemd runs ~/.config/systemd/user, so shipped unit fixes (#627) did not
  take effect after update. `mosaic update` now copies the fresh mosaic-*.service
  → the active dir + daemon-reload (best-effort, only when a fleet is installed).

Verified: bash F6 fixture (roster/custom-yaml/agents/run survive + examples
refreshed + schema seeded), 20/20 migration matrix; TS file-adapter keep-mode
test; 2 refreshActiveFleetUnits unit tests. tsc/eslint/prettier/sanitize clean.

Refs #631

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EsgTQzV5YUGk1JtCLP4B83

docs/scratchpads/631-reseed-preserves-fleet.md

@@ -0,0 +1,32 @@
+# #631 — re-seed must preserve user fleet data (CRITICAL data-loss)
+
+- **Issue:** #631 · **Branch:** `fix/631-reseed-preserves-fleet-data`
+
+## Root cause
+
+`mosaic update` auto-runs `install.sh` keep-mode sync (#610). install.sh's rsync `--delete` (keep mode)
+honored PRESERVE_PATHS, but `fleet/` wasn't listed → the sync WIPED `~/.config/mosaic/fleet/roster.yaml`
+(+ run/, agents/). Any user running `mosaic update` lost their roster. (overwrite mode wipes by design;
+the live loss was keep mode.)
+
+## Fix (PRIMARY)
+
+- install.sh PRESERVE_PATHS += `fleet/*.yaml`, `fleet/agents`, `fleet/run` — the framework still SEEDS
+  fleet/examples + fleet/roles + fleet/roster.schema.json (synced), but user files survive.
+- Made the cp-fallback (no-rsync) GLOB-AWARE so `fleet/*.yaml` preserves every user roster there too;
+  fixed the restore to re-glob per-pattern (so only the user file is restored, not the whole fleet/ dir).
+- file-adapter.ts (TS installer): mirrored the preserve list for parity. (TS syncDirectory is copy-only,
+  never --delete, so it never had the bug — belt-and-suspenders + parity.)
+
+## Fix (SECONDARY)
+
+- `refreshActiveFleetUnits()` (update-checker.ts): the re-seed updates ~/.config/mosaic/systemd/user but
+  systemd runs ~/.config/systemd/user, so unit fixes (#627) didn't take effect. After the re-seed,
+  `mosaic update` now copies the fresh mosaic-\*.service → the active dir + daemon-reload (best-effort,
+  only when a fleet is already installed). Wired into the cli.ts update flow.
+
+## Verification
+
+- bash F6 fixture (6 checks: roster/custom-yaml/agents/run survive + examples refreshed + schema seeded);
+  20/20 migration matrix green. TS file-adapter test (roster/run/agents survive keep sync). 2 unit tests
+  for refreshActiveFleetUnits. tsc/eslint/prettier/sanitize clean.