Fix #1658: Add commands_subdir field to support non-standard agent directory structures (#1660)

- Added commands_subdir field to AGENT_CONFIG for all agents
- Updated install_ai_skills() to use commands_subdir instead of hardcoded 'commands'
- Fixed --ai-skills flag for copilot, opencode, windsurf, codex, kilocode, q, and agy
- Bumped version to 0.1.5
- Updated AGENTS.md documentation with new field

Affected agents now correctly locate their command templates:
- copilot: .github/agents/
- opencode: .opencode/command/ (singular)
- windsurf: .windsurf/workflows/
- codex: .codex/prompts/
- kilocode: .kilocode/workflows/
- q: .amazonq/prompts/
- agy: .agent/workflows/

All 51 tests pass.

CHANGELOG.md

@@ -7,6 +7,15 @@ All notable changes to the Specify CLI and templates are documented here.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.1.5] - Unreleased
+
+### Fixed
+
+- **AI Skills Installation Bug (#1658)**: Fixed `--ai-skills` flag not generating skill files for GitHub Copilot and other agents with non-standard command directory structures
+  - Added `commands_subdir` field to `AGENT_CONFIG` to explicitly specify the subdirectory name for each agent
+  - Affected agents now work correctly: copilot (`.github/agents/`), opencode (`.opencode/command/`), windsurf (`.windsurf/workflows/`), codex (`.codex/prompts/`), kilocode (`.kilocode/workflows/`), q (`.amazonq/prompts/`), and agy (`.agent/workflows/`)
+  - The `install_ai_skills()` function now uses the correct path for all agents instead of assuming `commands/` for everyone
+
 ## [0.1.4] - Unreleased
 
 ### Fixed