fix(cli): support skill search shorthand queries

[christso]

Summary

• support allagents skill <query> shorthand for clearly search-shaped queries like pr-search and pr search
• allow allagents skill search pr search to treat the remaining tokens as one multi-word query
• rank skill search results by relevance instead of raw repo stars, and filter weak broad-match noise to better match gh skill search
• map --agent-help skill pr-search and --agent-help skill pr search to the skill search help metadata

Manual E2E

Red E2E (before change)

bun run build
node dist/index.js skill 'pr search'

Observed: error: found 1 error ... Not a valid subcommand name

Green E2E (after change)

bun run build
node dist/index.js skill pr-search --page nope
node dist/index.js skill pr search --page nope
node dist/index.js skill 'pr search' --page nope
node dist/index.js --agent-help skill pr-search

Verified:

• the three shorthand forms now route into skill search instead of failing subcommand parsing
• explicit multi-word parsing reaches search validation (Error: --page must be an integer.)
• --agent-help resolves shorthand invocations to the skill search metadata

Relevance validation

• aligned src/core/skill-search.ts with the upstream gh search pipeline: pre-rank, enrich, filter, re-rank, then deduplicate by skill name
• added unit coverage proving weak matches are filtered and exact/partial name matches outrank description-only matches
• spot-checked live results before rate limiting: pr search now matches the same top set as gh skill search

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