Phase 5 C1. Generalize the reconcile engine from app-only to an `ApplyOwner
{ App | Group }`, so a GROUP's own config + scripts can be declaratively
reconciled — the foundation for the tree-spanning project tool.
A group node is a subset of an app node (scripts + vars only; no routes /
triggers / secrets-values), so the diff, script/route/trigger/var CRUD, prune,
idempotency, and the Phase-4 inherited-target resolution are all reused
unchanged. Only the owner-varying bits switch on `ApplyOwner`:
* `load_current` — `list_for_group` + `VarOwner::Group` for a group (empty
routes/triggers/secrets); `list_for_app` for an app, exactly as before.
* script create owner (`NewScript{app_id|group_id}`), var writes (new
`set_group_var_tx`/`delete_group_var_tx` mirroring the app variants at
scope `*`), and the advisory lock (owner-tagged).
* `validate_bundle_for` rejects routes/triggers on a group bundle (422);
route-host validation, inherited-target resolution, the post-commit route
refresh, and the unreachable-endpoint warning are app-only.
`apply`/`plan` are unchanged thin wrappers over the new `apply_owner`/
`plan_owner`. New endpoints `POST /groups/{id}/{plan,apply}` gated by
`GroupScripts{Read,Write}` / `GroupVarsWrite`. `ApplyService` gains a `groups`
repo (the tree apply in C3 needs it too).
Live-validated: group plan → apply (group-owned script + var) → idempotent
re-plan noop → routes rejected 422 → DB confirms group ownership. App apply
unchanged: 391 manager-core unit tests + the apply/prune/staleness/overlay
journeys all green.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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