fix(install): preserve user fleet data on re-seed + refresh active units (CRITICAL) (#632)

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

docs/TASKS.md

@@ -82,3 +82,7 @@ Active workstream is **W1 — Federation v1**. Workers should:
 ## north-star doctrine consolidation — doc PR — feat/north-star-doctrine
 
 - Status: applied Mos's consolidated merge-map to docs/fleet/north-star.md (budget governance + control plane/central register + 200k cap + delegation + unified-identity Fleet + role-based naming + tmux security + drift re-captures). Doctrine only; #622/#623/#625/#628 out-of-scope. Conflict checklist green. Detail: scratchpads/north-star-doctrine.md.
+
+## #631 — re-seed preserves user fleet data (CRITICAL) — fix/631-reseed-preserves-fleet-data
+
+- Status: implemented + tested. PRIMARY: install.sh PRESERVE_PATHS += fleet/\*.yaml + fleet/agents + fleet/run (glob-aware cp-fallback); TS parity. SECONDARY: refreshActiveFleetUnits propagates unit fixes to ~/.config/systemd/user on mosaic update. bash F6 + TS + unit tests green. Detail: scratchpads/631-reseed-preserves-fleet.md.

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.