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/scratchpad.md.template

@@ -0,0 +1,92 @@
+# Issue #${ISSUE_NUMBER}: ${ISSUE_TITLE}
+
+**Project:** ${PROJECT}
+**Milestone:** ${MILESTONE}
+**Task ID:** ${TASK_ID}
+**Started:** ${CURRENT_DATETIME}
+**Agent:** ${AGENT_ID}
+
+---
+
+## Objective
+
+${TASK_DESCRIPTION}
+
+**Finding reference:** See `docs/reports/` for detailed finding (search for ${FINDING_ID})
+
+---
+
+## Approach
+
+### Analysis
+
+<!-- Initial analysis of what needs to be done -->
+
+### Implementation Plan
+
+1. [ ] Step 1
+2. [ ] Step 2
+3. [ ] Step 3
+
+### Files to Modify
+
+| File | Change |
+|------|--------|
+| `path/to/file.ts` | Description |
+
+---
+
+## Progress
+
+### ${CURRENT_DATE}
+
+- [ ] Implementation started
+- [ ] Tests written
+- [ ] Quality gates passing
+
+---
+
+## Testing
+
+### Commands
+
+```bash
+# Run relevant tests
+pnpm test --filter=@app/component
+pnpm lint
+pnpm typecheck
+```
+
+### Manual Verification
+
+- [ ] Feature works as expected
+- [ ] No regressions introduced
+
+---
+
+## Notes
+
+### Decisions Made
+
+<!-- Document key decisions and rationale -->
+
+### Blockers Encountered
+
+<!-- Document any blockers and how resolved -->
+
+### Learnings
+
+<!-- Document learnings for orchestrator-learnings.json -->
+
+---
+
+## Completion Checklist
+
+- [ ] Implementation complete
+- [ ] All tests passing
+- [ ] Quality gates pass (lint, typecheck)
+- [ ] Committed with proper message
+- [ ] tasks.md updated (by orchestrator)
+
+**Completed:**
+**Actual tokens:** K