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.

AGENTS.md

@@ -66,6 +66,7 @@ AGENT_CONFIG = {
     "new-agent-cli": {  # Use the ACTUAL CLI tool name (what users type in terminal)
         "name": "New Agent Display Name",
         "folder": ".newagent/",  # Directory for agent files
+        "commands_subdir": "commands",  # Subdirectory name for command files (default: "commands")
         "install_url": "https://example.com/install",  # URL for installation docs (or None if IDE-based)
         "requires_cli": True,  # True if CLI tool required, False for IDE-based agents
     },
@@ -83,6 +84,10 @@ This eliminates the need for special-case mappings throughout the codebase.
 
 - `name`: Human-readable display name shown to users
 - `folder`: Directory where agent-specific files are stored (relative to project root)
+- `commands_subdir`: Subdirectory name within the agent folder where command/prompt files are stored (default: `"commands"`)
+  - Most agents use `"commands"` (e.g., `.claude/commands/`)
+  - Some agents use alternative names: `"agents"` (copilot), `"workflows"` (windsurf, kilocode, agy), `"prompts"` (codex, q), `"command"` (opencode - singular)
+  - This field enables `--ai-skills` to locate command templates correctly for skill generation
 - `install_url`: Installation documentation URL (set to `None` for IDE-based agents)
 - `requires_cli`: Whether the agent requires a CLI tool check during initialization