Optional skills merged to main after a user's install was cut were
invisible to 'hermes skills install official/...' until they ran
'hermes update' — the OptionalSkillSource only scanned the local
optional-skills/ checkout.
Now, when an official/<category>/<skill> identifier is not found
locally, OptionalSkillSource resolves it against the live default
branch of NousResearch/hermes-agent: one Trees API call enumerates
optional-skills/*/SKILL.md dirs (cached on disk via the shared index
cache, 1h TTL), then the full skill directory is downloaded byte-exact
(including root-level install scripts, LICENSE, tests/ — files the
generic GitHubSource.fetch path drops). search() and inspect() also
surface remote-only skills so discovery works pre-update too.
Local checkout always wins when present; offline degrades to the old
local-only behavior; traversal and ambiguous bare names are refused;
provenance stays official/builtin.
Teknium
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