[AZ-1124] Add PT-10 gRPC stream perf scenario

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

_docs/03_implementation/batch_01_cycle12_report.md

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+# Batch Report
+
+**Batch**: 1
+**Tasks**: AZ-1124_pt10_grpc_stream_perf
+**Date**: 2026-06-26
+
+## Task Results
+
+| Task | Status | Files Modified | Tests | AC Coverage | Issues |
+|------|--------|---------------|-------|-------------|--------|
+| AZ-1124_pt10_grpc_stream_perf | Done | 10 files | 3/3 pass | 6/6 ACs covered | None |
+
+## AC Test Coverage: All covered
+
+| AC | Evidence |
+|----|----------|
+| AC-1 | `--run-pt10` + shell PT-10 section; `Program_DispatchesRunPt10Subcommand` |
+| AC-2 | `Percentile_MatchesHarnessFormula`; PT10_* stdout lines |
+| AC-3 | `check_threshold` in `run-performance-tests.sh` (Step 15 gate) |
+| AC-4 | `PT10_SLOW_CONSUMER` in probe + shell gate |
+| AC-5 | `performance-tests.md` PT-10 + traceability rows |
+| AC-6 | `PerfScript_DoesNotInlineJwtMint` |
+
+## Code Review Verdict: PASS
+
+## Auto-Fix Attempts: 0
+
+## Stuck Agents: None
+
+## Next Batch: All tasks complete