story-kit: queue 129_story_test_coverage_http_mcp_rs for QA

.story_kit/work/2_current/129_story_test_coverage_http_mcp_rs.md

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-name: "Add test coverage for http/mcp.rs (72% -> 85%+)"
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-# Story 129: Add test coverage for http/mcp.rs
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-Currently at 72% line coverage (1826 lines, 475 missed). This is the MCP tool server — the largest module and the interface agents use to interact with the system.
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-## What to test
-
-- Uncovered MCP tool handlers (check which tools lack test coverage)
-- Tool argument validation and error messages
-- Edge cases in existing tool handlers
-- The merge-queue and watcher-pause logic (added in story 119)
-- `resolve_simple_conflicts` edge cases
-- Tool dispatch routing
-
-## Notes
-
-- This is a large file — focus on the uncovered handlers rather than trying to test everything
-- Run `cargo llvm-cov --html` to identify specific uncovered lines/functions
-- The merge-related tools are the most critical gaps given recent changes
-- 475 missed lines is a lot — even covering half would be a big win
-
-## Acceptance Criteria
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-- [ ] Line coverage for `http/mcp.rs` reaches 85%+
-- [ ] Tests pass with `cargo test`
-- [ ] `cargo clippy` clean