feat(presets): pluggable preset system with template/command overrides, catalog, and resolver

- Rename 'template packs' to 'presets' to avoid naming collision with core templates
- PresetManifest, PresetRegistry, PresetManager, PresetCatalog, PresetResolver in presets.py
- Extract CommandRegistrar to agents.py as shared infrastructure
- CLI: specify preset list/add/remove/search/resolve/info
- CLI: specify preset catalog list/add/remove
- --preset option on specify init
- Priority-based preset stacking (--priority, lower = higher precedence)
- Command overrides registered into all detected agent directories (17+ agents)
- Extension command safety: skip registration if target extension not installed
- Multi-catalog support: env var, project config, user config, built-in defaults
- resolve_template() / Resolve-Template in bash/PowerShell scripts
- Self-test preset: overrides all 6 core templates + 1 command
- Scaffold with 4 examples: core/extension template and command overrides
- Preset catalog (catalog.json, catalog.community.json)
- Documentation: README.md, ARCHITECTURE.md, PUBLISHING.md
- 110 preset tests, 253 total tests passing

presets/self-test/templates/agent-file-template.md

@@ -0,0 +1,9 @@
+# Agent File (Self-Test Preset)
+
+<!-- preset:self-test -->
+
+> This template is provided by the self-test preset.
+
+## Agent Instructions
+
+Follow these guidelines when working on this project.

presets/self-test/templates/checklist-template.md

@@ -0,0 +1,15 @@
+# Checklist (Self-Test Preset)
+
+<!-- preset:self-test -->
+
+> This template is provided by the self-test preset.
+
+## Pre-Implementation
+
+- [ ] Spec reviewed
+- [ ] Plan approved
+
+## Post-Implementation
+
+- [ ] Tests passing
+- [ ] Documentation updated

presets/self-test/templates/constitution-template.md

@@ -0,0 +1,15 @@
+# Constitution (Self-Test Preset)
+
+<!-- preset:self-test -->
+
+> This template is provided by the self-test preset.
+
+## Principles
+
+1. Principle 1
+2. Principle 2
+
+## Guidelines
+
+- Guideline 1
+- Guideline 2

presets/self-test/templates/plan-template.md

@@ -0,0 +1,22 @@
+# Implementation Plan (Self-Test Preset)
+
+<!-- preset:self-test -->
+
+> This template is provided by the self-test preset.
+
+## Approach
+
+Describe the implementation approach.
+
+## Steps
+
+1. Step 1
+2. Step 2
+
+## Dependencies
+
+- Dependency 1
+
+## Risks
+
+- Risk 1

presets/self-test/templates/spec-template.md

@@ -0,0 +1,23 @@
+# Feature Specification (Self-Test Preset)
+
+<!-- preset:self-test -->
+
+> This template is provided by the self-test preset.
+
+## Overview
+
+Brief description of the feature.
+
+## Requirements
+
+- Requirement 1
+- Requirement 2
+
+## Design
+
+Describe the design approach.
+
+## Acceptance Criteria
+
+- [ ] Criterion 1
+- [ ] Criterion 2

presets/self-test/templates/tasks-template.md

@@ -0,0 +1,17 @@
+# Tasks (Self-Test Preset)
+
+<!-- preset:self-test -->
+
+> This template is provided by the self-test preset.
+
+## Task List
+
+- [ ] Task 1
+- [ ] Task 2
+
+## Estimation
+
+| Task | Estimate |
+|------|----------|
+| Task 1 | TBD |
+| Task 2 | TBD |