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/README.md

@@ -0,0 +1,76 @@
+# Mosaic Stack Orchestration Templates
+
+Templates for consistent orchestration setup within Mosaic Stack.
+
+## Usage
+
+### Variable Substitution
+
+Templates use `${VARIABLE}` syntax. Substitute using `envsubst`:
+
+```bash
+# Set variables
+export PROJECT="mosaic-stack"
+export MILESTONE="M6-Security"
+export CURRENT_DATETIME=$(date -Iseconds)
+
+# Generate file from template (paths relative to repo root)
+envsubst < docs/templates/orchestrator/tasks.md.template > docs/tasks.md
+```
+
+### Validation
+
+Check for unsubstituted variables:
+
+```bash
+grep -rE '\$\{[A-Z_]+\}' docs/tasks.md && echo "WARN: Unsubstituted variables" || echo "OK"
+```
+
+## Standard Variables
+
+| Variable              | Description          | Example                 |
+| --------------------- | -------------------- | ----------------------- |
+| `${PROJECT}`          | Project identifier   | `mosaic-stack`          |
+| `${MILESTONE}`        | Milestone identifier | `M6-AgentOrchestration` |
+| `${CURRENT_DATETIME}` | ISO datetime         | `2026-02-05T20:00:00Z`  |
+| `${PHASE_NUMBER}`     | Phase number         | `1`                     |
+| `${PHASE_ISSUE}`      | Gitea issue number   | `#337`                  |
+| `${PHASE_BRANCH}`     | Feature branch       | `fix/security`          |
+| `${TASK_PREFIX}`      | Task ID prefix       | `MS-SEC`                |
+
+## Template Index
+
+| Template                                            | Purpose                         |
+| --------------------------------------------------- | ------------------------------- |
+| `orchestrator/tasks.md.template`                    | Task tracking table with schema |
+| `orchestrator/orchestrator-learnings.json.template` | Variance tracking               |
+| `orchestrator/orchestrator-learnings.schema.md`     | JSON schema documentation       |
+| `orchestrator/phase-issue-body.md.template`         | Gitea issue body                |
+| `orchestrator/compaction-summary.md.template`       | 60% checkpoint format           |
+| `reports/review-report-scaffold.sh`                 | Creates report directory        |
+| `scratchpad.md.template`                            | Per-task working document       |
+
+## Quick Start
+
+```bash
+# From mosaic-stack root
+export PROJECT="mosaic-stack"
+export MILESTONE="M7-NewFeature"
+export CURRENT_DATETIME=$(date -Iseconds)
+export TASK_PREFIX="MS-001"
+export PHASE_ISSUE="#400"
+export PHASE_BRANCH="fix/feature"
+
+# Create tracking files
+envsubst < docs/templates/orchestrator/tasks.md.template > docs/tasks.md
+envsubst < docs/templates/orchestrator/orchestrator-learnings.json.template > docs/orchestrator-learnings.json
+
+# Create review report structure
+./docs/templates/reports/review-report-scaffold.sh codebase-review mosaic-stack
+```
+
+## Platform Integration
+
+These templates are part of Mosaic Stack's orchestration system. The orchestrator guide at `docs/claude/orchestrator.md` references these templates.
+
+**Self-contained:** All orchestration tooling ships with the platform. No external dependencies on `~/.claude/` or other repositories.