feat(adapter): implement MCP query adapter with get_impact, list_repos, and find_dead_code (Stories 3.1-3.2)
- Add memtrace-adapter.mjs: standalone Node.js MCP client over stdio
with 10000ms timeout, MEMTRACE_MCP_ERROR_TIMEOUT token,
structured JSON output matching qa-memtrace.mjs contract
- Support --query get_impact (blast radius), --query find_dead_code
(dead code detection with repo_id + file_path scoping),
--query list_repos (index freshness)
- Add 14 automated tests: 9 CLI arg handling + 5 MCP integration
- Update dev-story SKILL.md step 5 to use adapter for blast radius
and dead-code queries, with empty-results skip for pitfall validation
- Update quick-dev step-03-implement and step-oneshot workflows
- Extend code-review acceptance auditors with adapter usage verification
and dead-code adapter check
- Fix raw memtrace_get_impact reference in SKILL.md (review patch)
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