docs: setup metrics and reporting directory structure

- Create .github/reporting/ directory with comprehensive README
- Create .github/metrics/README.md documenting collection scripts
- Update docs/BRANDING.md to reference new structure
- Update .github/agents/README.md with metrics/reporting links
- Update .github/README.md directory structure diagram
- Update root README.md with new directory links

Establishes clear separation between:
- Metrics collection (.github/metrics/) - scripts, config, raw data
- Report publishing (.github/reporting/) - formatted outputs, archives

All documentation now properly cross-references the new folder structure.

Author: claude

.github/README.md

@@ -348,6 +348,19 @@ Directory Structure Details
 │   ├── project-meta-sync.yml
 │   └── ... (other workflows)
 │
+├── metrics/                # Metrics collection scripts and configuration
+│   ├── README.md
+│   ├── metrics.config.json
+│   ├── frontmatter-metrics.js
+│   ├── branding.json
+│   └── branding-log.md
+│
+├── reporting/              # Generated reports and metrics artifacts
+│   ├── README.md
+│   ├── frontmatter/
+│   ├── branding/
+│   └── issue-metrics/
+│
 ├── ISSUE_TEMPLATE/         # Issue templates for bugs, features, docs, tasks, etc.
 │   └── *.md
 │

.github/agents/README.md

@@ -272,6 +272,8 @@ graph TD
 | **Automation Governance** | Workflow and agent policies | [../AUTOMATION_GOVERNANCE.md](../AUTOMATION_GOVERNANCE.md) |
 | **Global AI Rules** | Organization-wide AI guidelines | [../../AGENTS.md](../../AGENTS.md) |
 | **Collections** | Curated agent toolkits | [../collections/](../collections/) |
+| **Metrics Directory** | Metrics collection and configuration | [../metrics/](../metrics/) |
+| **Reporting Directory** | Generated reports and artifacts | [../reporting/](../reporting/) |
 
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