## 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
Add PlanApplyService with diff(), artifacts(), persist_apply_summary(),
handle_merge_failure(), and guard_empty_changeset() methods.
- plan diff: renders changeset in rich/plain/json/yaml formats
- plan artifacts: shows plan metadata, changeset summary, sandbox refs
- persist_apply_summary: stores files_changed/validations_run in plan metadata
- handle_merge_failure: transitions plan to error state with conflict details
- guard_empty_changeset: blocks apply on empty changeset (--allow-empty override)
CLI: plan diff and plan artifacts commands with --format flag.
Tests: 20 Behave scenarios, 8 Robot integration tests, 4 ASV benchmarks.
Docs: docs/reference/plan_apply.md with CLI reference.
Implements D0b.apply from the implementation plan.
brent.edwards
freemo