Drew Newberry 07b5ddac33 feat(cluster): speed up local deploy loop with incremental change tracking (!53) ...

## Summary
- Track last deployed local changes and only redeploy new deltas in auto mode.
- Add per-component fingerprints (server/sandbox/helm) persisted to .cache/cluster-deploy-fast.state.
- Update docs for the new incremental deploy behavior.

```
mise run cluster

....

________________________________________________________
Executed in   75.21 secs      fish           external
   usr time  578.03 millis    0.25 millis  577.78 millis
   sys time  364.45 millis    1.22 millis  363.22 millis
```

with a change to `navigator-sandbox` (triggers rust recompile)

```
⟩ time mise run cluster:deploy
[cluster:deploy] $ build/scripts/cluster-deploy-fast.sh
Change detection took 0s
Fast deploy plan:
  build server:  0
  build sandbox: 1
  helm upgrade:  1

...

________________________________________________________
Executed in   25.88 secs      fish           external
   usr time  618.91 millis    0.24 millis  618.67 millis
   sys time  557.71 millis    1.54 millis  556.18 millis



```

(most time is spent in docker build)

## Test Plan
- mise run pre-commit

2026-02-25 08:34:43 -08:00

..

docker

feat(cluster): speed up local deploy loop with incremental change tracking (!53)

2026-02-25 08:34:43 -08:00

helm/navigator

feat(cluster): speed up local deploy loop with incremental change tracking (!53)

2026-02-25 08:34:43 -08:00

kube/manifests

feat(platform): cleanup api surface area and mtls flows (!39)

2026-02-24 11:33:33 -08:00