fix: reuse CLI skill projection

[0xpolarzero]

Skillgen and SyncSkills had copied their own command-to-skill collectors instead of reusing the one in Cli.ts.

The copied collectors had drifted from the CLI behavior used by --llms --format md.

Previous behavior

Aliases could leak into generated skills as if they were real commands:

const cli = Cli.create('tool').command('real', {
  aliases: ['r'],
  run: () => ({}),
})

// Before this fix, generated/synced skill markdown could contain both:
expect(content).toMatch(/^# tool real$/m)
expect(content).toMatch(/^# tool r$/m)

Fetch gateways were also treated like ordinary commands, so they missed the CLI's fetch-specific skill hint:

const cli = Cli.create('tool').command('api', {
  fetch: () => new Response('{}'),
})

// Before this fix, this was missing from Skillgen/SyncSkills output:
expect(content).not.toContain('Fetch gateway. Pass path segments')

Fixed behavior

Skillgen and SyncSkills now use the same projection as the CLI, so generated skills match --llms --format md:

expect(content).toMatch(/^# tool real$/m)
expect(content).not.toMatch(/^# tool r$/m)
expect(content).toContain('Fetch gateway. Pass path segments')

The tests also cover preserving examples and output schemas while reusing the shared projection.

Changes

• Exports the CLI skill projection and generated-skill frontmatter parser for reuse.
• Replaces the local Skillgen and SyncSkills collectors with the shared CLI projection.
• Adds regression coverage for aliases, fetch gateways, examples, and output schemas.

[0xpolarzero]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• fix(typegen): render schema edge cases #11
• fix: correct OpenAPI generated commands #10
• [TypeScript client] feat: RPC & in-memory clients #9
• [TypeScript client] feat: RPC & in-memory transports #8
• fix: reuse CLI skill projection #13 👈 (View in Graphite)
• fix(cli): preserve stream terminal records #12
• fix: normalize object validation errors #3
• main

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