Round 2 found text the PR's own changes made stale: the fixture's
option doc, handler summary and repro step still promised -32601 on
modern; the core skills.ts header still said Skills must never be in
ADVERTISABLE_EXTENSIONS; the listSkills and getSkillResult comments
still said the codec validates none of a skills result, or that the
result arrives as the server sent it; and two tests and a docs step
still described Tasks as the only registry extension. The backfill
test also now asserts the Skills declaration is on by default.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Q3RsrgCxVoFPokLB4vAkxi
Signed-off-by: cliffhall <cliff@futurescale.com>