[AZ-1132] Use system protoc in run-tests SDK container

Install protobuf-compiler and set PROTOBUF_PROTOC on arm64
where Grpc.Tools bundled protoc segfaults; align Woodpecker.

Co-authored-by: Cursor <cursoragent@cursor.com>

_docs/03_implementation/batch_01_cycle15_report.md

@@ -9,7 +9,7 @@
 
 | Task | Status | Files Modified | Tests | AC Coverage | Issues |
 |------|--------|---------------|-------|-------------|--------|
-| AZ-1132 | Done | 5 files | Validator unit: 144/144 PASS (host) | 5/5 ACs covered | Docker `protoc` segfault blocks `./scripts/run-tests.sh` on this host — Step 11 gate |
+| AZ-1132 | Done | 5 files | Full suite PASS (`run-tests.sh`, 457 unit + integration) | 5/5 ACs covered | None |
 
 ## AC Test Coverage
 

_docs/_autodev_state.md

@@ -2,12 +2,12 @@
 
 ## Current Step
 flow: existing-code
-step: 10
-name: Implement
-status: in_progress
+step: 11
+name: Run Tests
+status: completed
 sub_step:
-  phase: 1
-  name: parse
+  phase: 0
+  name: awaiting-invocation
   detail: ""
 retry_count: 0
 cycle: 15