fix(ci): unbreak the MCP server deploy — exclude tests from the prod build

[guillermoscript]

What

The last three pushes to master (#578, #576, #575) all failed deploy-mcp.yml. The production MCP image has not been rebuilt since — prod is running a stale MCP server.

Root cause

The Docker build runs mcp-use build, which type-checks everything in the tsconfig include, test files included:

src/branding.test.ts(1,38): error TS2307: Cannot find module 'vitest' or its corresponding type declarations.
src/tools/flashcards.test.ts(104,91): error TS7006: Parameter 'rating' implicitly has an 'any' type.
src/tools/practice.test.ts(1,38): error TS2307: Cannot find module 'vitest' ...

mcp-server has its own vitest.config.ts but does not declare vitest as a dependency — locally the import resolves by walking up into the repo root's node_modules. mcp-server/Dockerfile copies only mcp-server/, so inside the image there is no root to walk up to.

It first broke in f93a762 (#572), which added the three test files.

Fix

Exclude **/*.test.ts(x) from mcp-server/tsconfig.json. Test files should not be compiled into dist regardless, and this is preferable to shipping vitest into the production image.

QA

• docker build of mcp-server/Dockerfile locally: ✅ Type check passed!, 18 widgets built, image exported (fails on master with the errors above)
• npx vitest run in mcp-server: ✅ 5 files, 66 tests passing — the tests still run, they are only excluded from the build

Follow-up (not in this PR)

vitest is an undeclared dependency of mcp-server; npm test there only works because of root hoisting. Worth declaring, but that means touching mcp-server/package-lock.json, which is out of scope for a deploy hotfix.

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https://claude.ai/code/session_01FJ4dqwXuyKUPtg11ni5BSb