Planning updates.

+ Document gRPC interface, operational artifacts, and client libraries for Phases 7–9 planning.
+ Update PROGRESS.md to reflect completed design and pending implementation.

PROGRESS.md

@@ -4,9 +4,10 @@ Source of truth for current development state.
 
 ---
 
-## Current Status: Phase 6 Complete — Full Implementation
+## Current Status: Phase 6 Complete — Phases 7–9 Planned
 
-All phases complete. 117 tests pass with zero race conditions.
+117 tests pass with zero race conditions. Phases 7–9 are designed and
+documented; implementation not yet started.
 
 ### Completed Phases
 
@@ -18,6 +19,12 @@ All phases complete. 117 tests pass with zero race conditions.
 - [x] Phase 5: E2E tests, security hardening, commit
 - [x] Phase 6: mciasdb — direct SQLite maintenance tool
 
+### Planned Phases
+
+- [ ] Phase 7: gRPC interface (alternate transport; dual-stack with REST)
+- [ ] Phase 8: Operational artifacts (systemd unit, man pages, Makefile, install script)
+- [ ] Phase 9: Client libraries (Go, Rust, Common Lisp, Python)
+
 ---
 
 ## Implementation Log