fix(sync): parse skill descriptions with yaml

[natemoo-re]

bsh sync wrote a garbled skill index to AGENTS.md:

- **test** — [skills/test/SKILL.md](skills/test/SKILL.md) - > Vitest test runner with colocated

Two bugs:

• Block scalars leak their indicator. Every bundled skill uses description: >, and ultramatter returns the > as part of the value. It also mangles |-, >-, and |2 (e.g. |- → "- Lint it."). This PR replaces ultramatter, which only sync used, with yaml, a zero-dependency YAML parser.
• The first-sentence split cut at any period, so .test.ts truncated the test description. It now splits only on a period followed by whitespace or end of string.

Output against the bundled skills now:

- **test** — [skills/test/SKILL.md](skills/test/SKILL.md) - Vitest test runner with colocated .test.ts files and test utilities from @bomb.sh/tools/test-utils

updateAgentsMd is now exported so it can be tested directly.

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🦋 Changeset detected

Latest commit: 5fc3caf

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

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@bomb.sh/tools	Patch

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	yaml@​2.8.3 ⏵ 2.9.1	+1

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commit: 5fc3caf

[dreyfus92]

thank you @natemoo-re 💜