RT-151: wave-2 MCP tools (gate_ask, mr_comment_inline, mr_map) and gate_list cursor

[m4ttheweric]

Summary

Grows the MCP tool roster from 12 to 15 and adds cursor support to gate_list.

• gate_ask tool (RT-151): shared-presentation question over the daemon's gate:ask
• mr_comment_inline tool: dedicated 30s client write timeout, tightened repair/retry language
• mr_map tool (RT-154 re-parked): ships all-open-MR semantics; authors[me] filtering deferred to RT-154
• gate_list cursor plus tightened gate_answer rejection sentences (RT-155)
• Fixes mr_map repo-label ambiguity, adds a gate_ask env test, fixes a gate_list test fixture field name

Note: touches packages/rt-client/src/commands.ts (doc comment only, no shape change); rt-165 owns the 0.23.0 bump in that file, so this branch rebases over rt-165 once it lands.

Review

CodeRabbit was rate-limited (org cap: 1 review/hour) with zero comments posted; the usual fallback model (fable) was also out of usage credits, so this PR's substitute adversarial review ran on Claude Opus 5. No blocking findings. Fixed: three unguarded nested daemon-reply dereferences, gate_list's paging-end documentation, mr_comment_inline's missing GitLab-only note, an invalid test fixture value, and a gate_ask test that didn't actually cover the RT_GATE_SUBJECT-shadow contract it claimed (added the real C13 case; verified it fails without the fix). Two findings are ticketed separately rather than fixed here: a repo-identity heal-pair dedupe gap in resolveRepoIdentity (dormant today), and MCP tools returning raw daemon error codes instead of explainError prose.

🤖 Generated with Claude Code

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 3b50b70 and 3f6a457.

📒 Files selected for processing (4)

• e2e/tests/mcp-serve.test.ts
• lib/mcp/__tests__/tools.test.ts
• lib/mcp/tools.ts
• packages/rt-client/src/commands.ts

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_{Comment @coderabbitai help to get the list of available commands.}