fix(plan): add tier hydration and improve architecture review output (#10938)

## Summary

This PR fixes issue #10878 where architecture reviews were truncated because the regex pattern for parsing file output would stop at the first ``` encountered in the Markdown report.

## Changes

- Change file delimiters from ``` to >>>>>>>/<<<<<<< to avoid Markdown conflicts
- Add tier hydration before strategize phase in plan_executor.py
- Increase max_tokens to 16384 in llm_actors.py for longer outputs
- Increase context_max_tokens_hot from 16000 to 32000 in settings.py
- Fix get_hot_view → get_hot_fragments in strategy_actor.py and plan_executor.py
- Add opencode to skip directories in context_tier_hydrator.py
- Change sandbox output location to plan-output/ directory in plan.py
- Add get_context_summary stub method to acms_service.py

## Testing

Run architecture review action and verify the output report is complete with all sections.

Reviewed-on: #10938

benchmarks/apply_pipeline_bench.py

@@ -89,7 +89,7 @@ def _make_service(plan: MagicMock, changeset: SpecChangeSet) -> PlanApplyService
     lifecycle = MagicMock()
     lifecycle.get_plan.return_value = plan
     lifecycle.complete_apply.return_value = plan
-    lifecycle._commit_plan = MagicMock()
+    lifecycle.commit_plan = MagicMock()
     store = MagicMock()
     store.get.return_value = changeset
     return PlanApplyService(lifecycle_service=lifecycle, changeset_store=store)

benchmarks/error_recovery_bench.py

@@ -62,7 +62,7 @@ def _make_plan() -> MagicMock:
 def _make_service(plan: MagicMock) -> ErrorRecoveryService:
     lifecycle = MagicMock()
     lifecycle.get_plan.return_value = plan
-    lifecycle._commit_plan = MagicMock()
+    lifecycle.commit_plan = MagicMock()
     return ErrorRecoveryService(
         lifecycle_service=lifecycle,
         auto_retry_threshold=0.0,

benchmarks/plan_diff_bench.py

@@ -98,7 +98,7 @@ def _create_plan_and_service() -> tuple[str, PlanApplyService, InMemoryChangeSet
     plan = lifecycle.get_plan(plan_id)
     plan.changeset_id = cs.changeset_id
     plan.sandbox_refs = ["sandbox-bench-001"]
-    lifecycle._commit_plan(plan)
+    lifecycle.commit_plan(plan)
 
     return plan_id, apply_svc, store
 

benchmarks/plan_resume_bench.py

@@ -66,7 +66,7 @@ def _make_errored_plan(lifecycle: PlanLifecycleService, action_name: str) -> str
     lifecycle.start_strategize(pid)
     p = lifecycle.get_plan(pid)
     p.decision_root_id = str(ULID())
-    lifecycle._commit_plan(p)
+    lifecycle.commit_plan(p)
     lifecycle.complete_strategize(pid)
     lifecycle.execute_plan(pid)
     lifecycle.start_execute(pid)
@@ -104,7 +104,7 @@ class TimeCheckpointRecording:
         self.lifecycle.start_strategize(pid)
         p = self.lifecycle.get_plan(pid)
         p.decision_root_id = str(ULID())
-        self.lifecycle._commit_plan(p)
+        self.lifecycle.commit_plan(p)
         self.lifecycle.complete_strategize(pid)
         self.lifecycle.execute_plan(pid)
         self.lifecycle.start_execute(pid)