feat(PMEM-WP-0017): federated store management CLI and activity reports

Add phase_memory.management for cross-store discovery and windowed
activity reporting. Extend the phase-memory CLI with stores list and
report commands, plus make report-7d for the default weekly operator view.

tests/fixtures/management/local-store/audit.jsonl

@@ -0,0 +1,2 @@
+{"operation":"package.compile","operation_id":"op:audit-old","timestamp":"2026-06-02T08:00:00+00:00"}
+{"operation":"audit.query","operation_id":"op:audit-in-window","timestamp":"2026-07-02T10:00:00+00:00"}

tests/fixtures/management/local-store/events.jsonl

@@ -0,0 +1,2 @@
+{"id":"event:old","kind":"path.created","schema_version":"markitect.memory.event.v1","timestamp":"2026-06-01T08:00:00+00:00"}
+{"id":"event:in-window","kind":"lifecycle.apply","schema_version":"markitect.memory.event.v1","timestamp":"2026-07-02T09:00:00+00:00"}

tests/fixtures/management/local-store/phase-memory.json

@@ -0,0 +1,3 @@
+{
+  "schema_version": "phase_memory.local_store.v1"
+}