karellen / kubernator / 24580658204 / 1

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Refactor k8s apply: SSA test-ops, 409 retry, watch-based delete, imperative API (#102)

## Summary

- Harden the K8s apply path with SSA-derived JSON-patch `test` ops for
`/metadata/uid` and `/metadata/resourceVersion`, and wrap the SSA patch
branch in a 409-retry loop that recomputes the patch on conflict.
- Extend `K8SResource` with `list()`, `watch()`, `delete(wait=True)`
that uses watch + `get()` recheck, and add a `resource_generator()`
extension seam on `KubernetesPlugin`.
- Add `ktor.k8s.resource(manifest)` — a fully-wired `K8SResource`
factory for imperative CRUD from `.kubernator.py` scripts, bypassing the
declarative apply lifecycle.
- Thread the applied manifest as a 4th return from `_apply_resource` and
its inner patch/create/delete callables for external consumers.
- Move dump-file open/close from `app.py` into
`KubernetesPlugin.handle_apply`; fix dump-mode `patch_func` to seed
uid/RV on a copy of the local manifest by extracting them from the
patch's own test ops (via `jsonpointer`), so the simulated post-patch
manifest can be returned honestly.
- Rewrite `delete_create` and `resource_version_merge` integration tests
as single-phase using the new imperative API, replacing `kubectl`-based
phase-1 setup and the `TEST_PHASE` env re-invocation.
- Add unit test for 409 retry and integration tests for `watch()` and
`resource_generator`. Port `resource_version_merge` from minikube to
kind.

## Test plan

- [x] `pyb -vX run_unit_tests` (32 tests, all green — includes new
`k8s_apply_retry_tests`)
- [x] `pyb -vX run_integration_tests -P
integrationtest_file_glob=delete_create_tests.py` (single-phase, kind,
immutable-field delete+recreate path)
- [x] `pyb -vX run_integration_tests -P
integrationtest_file_glob=resource_version_merge_tests.py`
(single-phase, kind, dump mode patch verification)
- [ ] Full `pyb -vX run_integration_tests` suite via CI across the
Python 3.10–3.14 matrix

611 of 976 branches covered (62.6%)

Branch coverage included in aggregate %.

3034 of 3711 relevant lines covered (81.76%)

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