feat: Add self-contained orchestration templates and guide

Makes Mosaic Stack self-contained for orchestration - no external dependencies.

New files:
- docs/claude/orchestrator.md - Platform-specific orchestrator protocol
- docs/templates/ - Bootstrap templates for tasks.md, learnings, reports

Templates:
- orchestrator/tasks.md.template - Task tracking scaffold
- orchestrator/orchestrator-learnings.json.template - Variance tracking
- orchestrator/orchestrator-learnings.schema.md - JSON schema docs
- orchestrator/phase-issue-body.md.template - Gitea issue body
- orchestrator/compaction-summary.md.template - 60% checkpoint format
- reports/review-report-scaffold.sh - Creates report directory
- scratchpad.md.template - Per-task working document

Updated CLAUDE.md:
- References local docs/claude/orchestrator.md instead of ~/.claude/
- Added Platform Templates section pointing to docs/templates/

This enables deployment without requiring user-level ~/.claude/ configuration.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docs/templates/orchestrator/compaction-summary.md.template

@@ -0,0 +1,51 @@
+## Compaction Summary
+
+**Project:** ${PROJECT}
+**Milestone:** ${MILESTONE}
+**Time:** ${CURRENT_DATETIME}
+**Context at compaction:** ${CONTEXT_PERCENT}%
+
+---
+
+### Completed Tasks
+
+| Task | Description | Tokens | Variance |
+|------|-------------|--------|----------|
+| ${TASK_1_ID} | ${TASK_1_DESC} | ${TASK_1_USED} | ${TASK_1_VARIANCE} |
+
+**Phase progress:** ${COMPLETED_COUNT}/${TOTAL_COUNT} tasks
+
+---
+
+### Quality Status
+
+- **Tests:** ${TEST_STATUS}
+- **Lint:** ${LINT_STATUS}
+- **Typecheck:** ${TYPECHECK_STATUS}
+- **Regressions:** ${REGRESSION_COUNT}
+
+---
+
+### Learnings Captured
+
+<!-- Include if variance > 50% on any task -->
+- ${LEARNING_1}
+
+---
+
+### Remaining Tasks
+
+| Task | Description | Status | Estimate |
+|------|-------------|--------|----------|
+| ${NEXT_TASK_ID} | ${NEXT_TASK_DESC} | ready | ${NEXT_TASK_EST} |
+
+---
+
+### Resuming With
+
+**Next task:** ${NEXT_TASK_ID}
+**Reason:** First unblocked task in queue
+
+---
+
+*Context reduced from ${CONTEXT_BEFORE}% to ~25-30%*