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/orchestrator-learnings.schema.md

@@ -0,0 +1,113 @@
+# Orchestrator Learnings JSON Schema
+
+Reference documentation for `orchestrator-learnings.json` structure.
+
+## Root Object
+
+```json
+{
+  "schema_version": "1.0",
+  "project": "string - Project identifier",
+  "milestone": "string - Milestone identifier",
+  "created_at": "ISO8601 - When file was created",
+  "learnings": [],
+  "phase_summaries": [],
+  "proposed_adjustments": [],
+  "investigation_queue": []
+}
+```
+
+## Learning Entry
+
+Captured when |variance| > 50%.
+
+```json
+{
+  "task_id": "string - Matches task ID from tasks.md (e.g., MS-SEC-001)",
+  "task_type": "enum - See Task Types below",
+  "estimate_k": "number - Estimated tokens in thousands",
+  "actual_k": "number - Actual tokens used in thousands",
+  "variance_pct": "number - ((actual - estimate) / estimate) * 100",
+  "characteristics": {
+    "file_count": "number - Files modified",
+    "keywords": ["array - Descriptive tags for pattern matching"]
+  },
+  "analysis": "string - Human/AI explanation of variance",
+  "flags": ["array - CRITICAL | NEEDS_INVESTIGATION | ANOMALY"],
+  "captured_at": "ISO8601 - When learning was recorded"
+}
+```
+
+### Task Types
+
+| Type                     | Description                                | Base Estimate    |
+| ------------------------ | ------------------------------------------ | ---------------- |
+| `STYLE_FIX`              | Formatting, prettier, lint fixes           | 3-5K             |
+| `BULK_CLEANUP`           | Multi-file cleanup (unused vars, warnings) | file_count × 550 |
+| `GUARD_ADD`              | Add guards, decorators, validation         | 5-8K             |
+| `AUTH_ADD`               | Authentication implementation              | 15-25K           |
+| `ERROR_HANDLING`         | Error handling improvements                | 8-12K            |
+| `CONFIG_DEFAULT_CHANGE`  | Config default changes                     | 5-10K            |
+| `CONFIG_EXTERNALIZATION` | Move hardcoded values to env vars          | 8-12K            |
+| `INPUT_VALIDATION`       | Input sanitization, allowlists             | 5-8K             |
+| `BUG_FIX_SIMPLE`         | Simple bug fixes (single file)             | 3-8K             |
+| `REFACTOR`               | Code refactoring                           | 10-15K           |
+| `COMPLEX_REFACTOR`       | Multi-file architectural changes           | 25-40K           |
+| `TEST_ADD`               | Adding test coverage                       | 15-25K           |
+
+## Phase Summary
+
+Generated after phase verification task.
+
+```json
+{
+  "phase": "number - Phase number",
+  "tasks_completed": "number",
+  "tasks_total": "number",
+  "estimate_total_k": "number - Sum of estimates",
+  "actual_total_k": "number - Sum of actual usage",
+  "variance_avg_pct": "number - Average variance",
+  "pattern": "enum - SYSTEMATIC_UNDERESTIMATE | ACCURATE | OVERESTIMATE",
+  "notes": "string - Summary observations"
+}
+```
+
+## Proposed Adjustment
+
+Heuristic improvement proposals.
+
+```json
+{
+  "category": "string - Task type category",
+  "current_heuristic": "string - Current estimation formula",
+  "proposed_heuristic": "string - Improved formula",
+  "confidence": "enum - HIGH | MEDIUM | LOW",
+  "evidence": ["array - Task IDs supporting this"],
+  "variance_if_applied": "string - Expected improvement",
+  "notes": "string - Additional context"
+}
+```
+
+## Investigation Queue
+
+Tasks requiring manual review.
+
+```json
+{
+  "task_id": "string",
+  "question": "string - What needs investigation",
+  "priority": "enum - HIGH | MEDIUM | LOW",
+  "status": "enum - OPEN | IN_PROGRESS | CLOSED",
+  "resolution": "string - Outcome when closed",
+  "verified_at": "ISO8601 - When investigation completed"
+}
+```
+
+## Variance Thresholds
+
+| Variance | Action                                |
+| -------- | ------------------------------------- |
+| 0-30%    | Log only (acceptable)                 |
+| 30-50%   | Flag for review                       |
+| 50-100%  | Capture learning                      |
+| >100%    | CRITICAL — review task classification |