feat!: scope per-app config and settings by environment

BREAKING: wipe dev PostgreSQL before deploying — V1 checksum changes.
Agents must now send environmentId on registration (400 if missing).

Two tables previously keyed on app name alone caused cross-environment
data bleed: writing config for (app=X, env=dev) would overwrite the row
used by (app=X, env=prod) agents, and agent startup fetches ignored env
entirely.

- V1 schema: application_config and app_settings are now PK (app, env).
- Repositories: env-keyed finders/saves; env is the authoritative column,
  stamped on the stored JSON so the row agrees with itself.
- ApplicationConfigController.getConfig is dual-mode — AGENT role uses
  JWT env claim (agents cannot spoof env); non-agent callers provide env
  via ?environment= query param.
- AppSettingsController endpoints now require ?environment=.
- SensitiveKeysAdminController fan-out iterates (app, env) slices so each
  env gets its own merged keys.
- DiagramController ingestion stamps env on TaggedDiagram; ClickHouse
  route_diagrams INSERT + findProcessorRouteMapping are env-scoped.
- AgentRegistrationController: environmentId is required on register;
  removed all "default" fallbacks from register/refresh/heartbeat auto-heal.
- UI hooks (useApplicationConfig, useProcessorRouteMapping, useAppSettings,
  useAllAppSettings, useUpdateAppSettings) take env, wired to
  useEnvironmentStore at all call sites.
- New ConfigEnvIsolationIT covers env-isolation for both repositories.

Plan in docs/superpowers/plans/2026-04-16-environment-scoping.md.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.claude/rules/core-classes.md

@@ -74,7 +74,7 @@ paths:
 - `SensitiveKeysConfig` — record: keys (List<String>, immutable)
 - `SensitiveKeysRepository` — interface: find(), save()
 - `SensitiveKeysMerger` — pure function: merge(global, perApp) -> union with case-insensitive dedup, preserves first-seen casing. Returns null when both inputs null.
-- `AppSettings`, `AppSettingsRepository` — per-app settings config and persistence
+- `AppSettings`, `AppSettingsRepository` — per-app-per-env settings config and persistence. Record carries `(applicationId, environment, …)`; repository methods are `findByApplicationAndEnvironment`, `findByEnvironment`, `save`, `delete(appId, env)`. `AppSettings.defaults(appId, env)` produces a default instance scoped to an environment.
 - `ThresholdConfig`, `ThresholdRepository` — alerting threshold config and persistence
 - `AuditService` — audit logging facade
 - `AuditRecord`, `AuditResult`, `AuditCategory`, `AuditRepository` — audit trail records and persistence
@@ -95,4 +95,4 @@ paths:
 - `ChunkAccumulator` — batches data for efficient flush
 - `WriteBuffer` — bounded ring buffer for async flush
 - `BufferedLogEntry` — log entry wrapper with metadata
-- `MergedExecution`, `TaggedExecution`, `TaggedDiagram` — tagged ingestion records
+- `MergedExecution`, `TaggedExecution`, `TaggedDiagram` — tagged ingestion records. `TaggedDiagram` carries `(instanceId, applicationId, environment, graph)` — env is resolved from the agent registry in the controller and stamped on the ClickHouse `route_diagrams` row.