ci: drop the Target B managed build job

[pythonlearner1025]

What part this touches

• .github/workflows/ci.yml is the check matrix that runs on every push and pull request.
• Target B is the blitz.dev managed deployment: the control plane emitted as plain source files instead of a bundled Worker. The emitter is packages/control-plane/scripts/build-blitzdev.mjs.
• The Target B managed build (blitz.dev) job ran that emitter and eight vitest files under BLITZDEV_MANAGED=1.

The gap

• The job was added on 2026-08-21 because nothing else in CI built the managed artifact, and a missing manifest entry once shipped a deploy that failed every route.
• Since then the JavaScript job runs npm test with BLITZDEV_MANAGED=1. The same eight suites run there, closure gate included, and blitzdev-emitter.test.ts imports the real emitter.
• The job's only extra work is the blitzdev:build command line. It costs about 52 s per run, and the matrix runs twice per pull request.
• Target B itself is dormant: plans/BLITZDEV-PLATFORM-ASKS.md says its production promotion waits for a platform lift, and the emitter last changed in August.

The fix

• Remove the blitzdev job and its comment block from ci.yml.
• Nothing else changes. The emitter, its tests and the blitzdev:build script stay in the tree.

The risk trade

• The blitzdev:build command line itself no longer runs in CI. The emitter module it calls is exercised by blitzdev-emitter.test.ts in the JavaScript job. If the command-line wrapper ever drifts from the module, the first person to run it finds out.
• Reviving Target B needs no CI change: the suites still run on every push.
• I rejected folding the build step into the JavaScript job. It would add the same redundant minute to the job every product change waits on.

Tests

• node --test test/deploy-tooling.test.mjs in packages/control-plane parses both workflows and passes.
• The removed job has no references in docs, tests or scripts.
• GitHub validates the workflow on the first run of this branch.

Deploy

• The workflow file ships itself. The next push runs five jobs instead of six.
• Rollback: revert the commit.

🤖 Generated with Claude Code

https://claude.ai/code/session_01So15XYnmh9Hfx9xdNgG1Yu