ci: no CI job runs typecheck, and main currently fails it #1412

What

No CI job runs the compiler. bun turbo typecheck runs only in release.yml and in the local pre-push hook. The CI "TypeScript" job runs the test suite, which bun executes without type-checking.

So main currently fails typecheck, and CI is green:

test/session/trace-context-loop.test.ts(25,18): error TS2739: Type '{ status: ...; entry: ... }'
is missing the following properties from type 'Interface': listMeta, snapshot
Failed: @altimateai/altimate-code#typecheck

#1308 added listMeta and snapshot to the MCP service interface and updated the mocks that existed then. #1400, open at the same time, added a new mock without them. Each PR passed on its own; together they broke typecheck on main at f8191ab.

Why it matters

• Every contributor who merges main now has git push blocked by the pre-push typecheck, for code they did not touch. pre-push blocks pushes on a typecheck error in unmodified src/bus/global.ts #1165 is the same failure from an earlier break.
• The next release would fail its typecheck gate.

Reproduce

On main: bun install && bun turbo typecheck --continue. 12 of 13 packages pass; @altimateai/altimate-code fails with the error above.

Suggested fix

Add the two members to that mock, and add a CI job that runs bun turbo typecheck on pull requests and on pushes to main, so the next break shows up in CI.