The default skills lookup only scanned the project-relative
.agents/skills directory, so personal skills had to be repeated
per project or wired in via CODER_AGENT_EXP_SKILLS_DIRS. Now the
default is the comma-separated list ~/.coder/skills,.agents/skills,
which lets discoverSkills's existing first-occurrence-wins policy
prefer home-scoped skills over project ones with the same name.
The change is additive when ~/.coder/skills is absent
(missing directories are silently skipped in discoverSkills) and
unaffects users who set the env var explicitly.
Closes CODAGT-403
Mathias Fredriksson
5b87d7b74f