Re-scopes #2324 to cover the second user-facing pain: GitHub Copilot's
Custom Agents picker, where installed BMAD skills currently don't show up
even though slash commands work natively.
Generalizes the per-platform pointer-file mechanism so the same
installCommandPointers / cleanupCommandPointers code path serves both
OpenCode (slash commands palette) and Copilot (Custom Agents picker), with
all platform-specific shape pushed into platform-codes.yaml as data:
- commands_target_dir — where pointer files live (existing)
- commands_extension — file extension (default '.md'; Copilot uses
'.agent.md' per VS Code Custom Agents docs)
- commands_body_template — pointer body, supports {canonicalId} and
{target_dir} placeholders. Default matches
OpenCode's `@skills/<id>` resolver. Copilot
has no such resolver, so its template uses
the {project-root}/<target_dir>/<id>/SKILL.md
LOAD pattern (consistent with PR #1769).
OpenCode behavior is unchanged. Copilot users now get a per-skill
.github/agents/<canonicalId>.agent.md file that surfaces the skill in the
Custom Agents picker — addressing the "agents being gone" complaint
flagged by enterprise users.
Tests: extends Suite 17 with assertions for Copilot agent pointer
creation, body content (LOAD pattern with {project-root}-rooted path),
and idempotency. 318 tests pass (was 310).
Refs #2267
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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