* fix(query/agent-skills): emit raw <agent_skills> block instead of JSON-wrapped string
The CLI dispatcher (`cli.ts`) JSON-stringifies all query handler results via
`console.log(JSON.stringify(result.data, null, 2))`. For the `agent-skills`
handler this produced a JSON-quoted string literal — e.g.
`"<agent_skills>\n…</agent_skills>"` — which workflows embedded verbatim via
`$(gsd-sdk query agent-skills gsd-planner)`, breaking all `<agent_skills>`
injection into spawned subagent prompts.
Fix: add an optional `format: 'json' | 'text'` field to `QueryResult`. When a
handler returns `format: 'text'` and `--pick` is not active, the CLI writes the
string directly via `process.stdout.write` instead of JSON-stringifying it.
`agentSkills` sets `format: 'text'` for non-empty blocks.
Regression guard: two new CLI integration tests in `skills.test.ts` spawn the
CLI as a child process and assert that (a) a mapped agent type receives the raw
XML block on stdout and (b) an unmapped agent type produces the existing JSON
empty-string output.
Fixes#2914.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
* docs(changelog): add #2917 entry under Unreleased Fixed
---------
Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>
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