refactor(cli): name the MCP launch-command transform after what it does

[blafourcade]

🎯 What & why

cli/src/contexts/tools/domain/mcp-exclusion.ts now holds only transformFor: the Windows transform of an MCP server's launch command (npx → cmd /c npx, uvx → uvx.exe, uv → uv.exe). The MCP exclusion it was named for was deleted by #816. The file name pointed a reader at a feature that no longer exists, against the repository's rule to name by intention, not by history (#824).

🛠️ How it works

A pure rename, with no behaviour change:

• src/contexts/tools/domain/mcp-exclusion.ts → mcp-launch-command.ts;
• tests/contexts/tools/domain/mcp-exclusion.unit.test.ts → mcp-launch-command.unit.test.ts;
• the one import, in install-config-use-case.ts;
• the module's entry in the tools public-module list of tests/architecture/context-boundary.arch.test.ts.

git mv keeps both files' history. The function name transformFor is unchanged: the module name now says what it transforms.

🧪 How to verify

• Red first: with the file renamed and the public-module list not yet updated, context-boundary.arch.test.ts failed with install-config-use-case.ts -> src/contexts/tools/domain/mcp-launch-command.ts, a cross-context import to an undeclared module. It passes once the list names the new module.
• grep -rn mcp-exclusion cli/src cli/tests finds nothing.

Local results:

Check	Result
typecheck, lint, knip, type honesty	pass
architecture	128 passed
unit + integration	5784 passed, the same count as next
comment lines	src/ 4471, tests/ 2987, unchanged

⚠️ Heads-up

• cli/CHANGELOG.md and the dated task documents under aidd_docs/tasks/ still say mcp-exclusion. They are history, left as written.
• The manifest test "a manifest written while the CLI still recorded MCP exclusions" is about an old manifest format, not this module, and stays.

🔗 Linked issue

Fixes #824

✅ I certify

• I DO CERTIFY I READ EACH LINE OF THE PULL REQUEST BECAUSE I AM A SOFTWARE ENGINEER, NOT A AI PUPPY.

🤖 Generated with Claude Code

https://claude.ai/code/session_011x4ms5qcGuZgYhCxfdHMUb