Refactor commands to skills terminology (#66)

* Refactor commands to skills terminology

BREAKING CHANGES:
- Directory structure: `.claude/commands/` → `.claude/skills/`
- Directory structure: `.gemini/commands/` → `.gemini/skills/`
- Class renamed: `CommandGenerator` → `SkillGenerator`
- Enum renamed: `CommandLifecycleHook` → `SkillLifecycleHook`
- Removed `uw.` prefix convention for hidden steps
- Hidden steps now use `user-invocable: false` in YAML frontmatter

Changes:
- Renamed all command-related classes, methods, and variables to use "skill"
- Updated templates from command-*.jinja to skill-*.jinja
- Added `user-invocable: false` frontmatter for non-exposed skills
- Updated all tests, documentation, and standard jobs
- Version bumped to 0.5.0

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Apply best practices to skill jinja templates

- Streamline template structure with critical guidance upfront
- Simplify descriptions to be concise and search-friendly
- Add explicit step-by-step instructions with clear goals
- Improve section organization (Prerequisites, Inputs, Outputs, Completion)
- Add platform-specific notes (Claude: Skill tool, Gemini: manual invocation)
- Clarify description guidelines in best practices rule file

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Add commit job for test/lint/push workflow

New repo-specific job with three steps:
- test: Pull latest code and run tests until passing
- lint: Run ruff format and check via sub-agent (haiku model)
- commit_and_push: Review changed files with user, then commit and push

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Fix Claude skill format to use directory/SKILL.md structure

Claude Code requires skills to be directories containing SKILL.md files
with both 'name' and 'description' fields in frontmatter.

Changes:
- Update ClaudeAdapter to return directory/SKILL.md paths
- Add required 'name' field to Claude skill templates
- Update generator to extract skill names from new path format
- Add SKILL.md validation rule (triggers on **/SKILL.md)
- Update tests to match new structure and template output

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Simplify commit job step instructions

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: nhorton

.claude/commands/add_platform.md

@@ -1,6 +1,11 @@
 {
   "permissions": {
     "allow": [
+      "WebFetch(domain:code.claude.com)",
+      "WebFetch(domain:www.anthropic.com)",
+      "WebFetch(domain:anthropic.com)",
+      "WebFetch(domain:platform.claude.com)",
+      "WebFetch(domain:docs.anthropic.com)",
       "Bash(ls:*)",
       "Bash(grep:*)",
       "Bash(find:*)",