fix(publish): make the release-tooling fixture hermetic

[kjgbot]

The publish pipeline's first real dispatch (run 34035686278, dry_run: true) failed at its own Test release tooling step, so nothing downstream ever ran.

The input did not match /missing package\/dist\/index.js/. Input:
  > @relayflows/surface@2.0.0 prepare
  > bun run build
  $ tsc
  error: script "build" exited with code 1
  Error: Command failed: npm pack --ignore-scripts --json --pack-destination …

The fixture copies each real package.json verbatim — prepare included. Despite --ignore-scripts, npm ran prepare → bun run build → tsc inside a mkdtemp directory that installs no toolchain, so npm failed before pack-release.mjs could emit the missing package/dist/index.js error the test asserts on.

Dropping prepare/prepack/postpack/prepublishOnly from the fixture makes it hermetic. It only ever needed the manifests, not the packaging lifecycle.

The part worth noting

This test passes on my machine, and passed before this change. It was reading the developer's environment rather than the code — this host has the toolchain the fixture never installs. That is the same shape as the analyzer test that only ever ran here, and it is why I am not claiming a local green as evidence: CI is the only verification that means anything for this one.

Everything else in the pipeline is untested as a result — Version all packages, the pack-and-assert steps, and the runtime binary build all show skipped in that run because the job died at step 7 of 17.

🤖 Generated with Claude Code

https://claude.ai/code/session_01FtQSAcGDta5VH9xiZFT4sR

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