Add reference/tools/ category with Dagger, ArgoCD CLI, Ansible, and Pulumi cards (#178)

## Summary

- Create `docs/reference/tools/` with four reference cards: Dagger (build engine), ArgoCD CLI (deployment workflows), Ansible (config management), and Pulumi (DNS/Tailscale IaC)
- Move `ansible/roles.md` → `tools/ansible.md`, broadened with CLI patterns and dry-run usage
- Update `reference.md` index: add "Tools" section, remove old "Ansible" section
- Update `update-documentation.md` to reflect Dagger build process (workflow steps, manual build recipe, runner environment)
- Update `adopt-dagger-ci.md` plan to note how-to articles were handled via reference card + existing how-to updates
- Fix all broken `[[roles]]` wiki-links across 5 files → `[[ansible]]`

## Verification

- `docs-check-links` ✓ — no broken wiki-links
- `docs-check-index` ✓ — all docs referenced in category index
- `docs-check-filenames` ✓ — no duplicate filenames
- All pre-commit hooks pass

Reviewed-on: https://forge.ops.eblu.me/eblume/blumeops/pulls/178

docs/tutorials/replication/observability-stack.md

@@ -178,7 +178,7 @@ spec:
     namespace: monitoring
 ```
 
-BluemeOps uses Alloy on both [[indri]] (for host metrics, via [[roles|Ansible role]]) and in the [[cluster]] (for pod logs and service probes).
+BluemeOps uses Alloy on both [[indri]] (for host metrics, via [[ansible|Ansible role]]) and in the [[cluster]] (for pod logs and service probes).
 
 ## What You Now Have