fix(docker): copy head-response-guard.cjs into the standalone bundle (boot crash)

[MikeTuev]

Problem

The standalone Docker image (targets runner-base / runner-web / runner-cli) crashes at boot:

Error [ERR_MODULE_NOT_FOUND]: Cannot find module '/app/head-response-guard.cjs' imported from /app/server-ws.mjs

#6608 ("close HEAD requests immediately instead of hanging", #6400) added

import headResponseGuard from "./head-response-guard.cjs";

to scripts/dev/standalone-server-ws.mjs, but did not add a copy entry to scripts/build/assembleStandalone.mjs. That script copies each server-ws.mjs sibling dependency into the standalone bundle individually (peer-stamp.mjs, http-method-guard.cjs, responses-ws-proxy.mjs, webdav-handler.mjs, tls-options.mjs) — so the new module never lands in the image and the container restart-loops.

Fix

• Add the missing copy entry for head-response-guard.cjs to assembleStandalone.mjs.
• Regression test tests/unit/standalone-server-ws-deps-copied.test.ts extracts all relative imports of standalone-server-ws.mjs and asserts each one has a copy entry — so any future sibling module added to server-ws without a copy entry fails CI instead of breaking the container at boot.

Validation (TDD, Hard Rule #18)

• Test written first, failed with: assembleStandalone.mjs must copy these server-ws.mjs dependencies: head-response-guard.cjs; passes after the fix.
• Rebuilt the Docker image (--target runner-cli) from this branch and verified /app/head-response-guard.cjs and /app/server-ws.mjs are present; the previous ERR_MODULE_NOT_FOUND boot crash is gone.

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[diegosouzapw]

Thanks for catching this — same root cause and same fix as #6908, which was opened independently and landed a slightly more thorough regression test (it exercises the real copy function against a temp directory rather than string-matching the source). Since both patches touch the identical EXTRA_MODULE_ENTRIES lines and conflict with each other, I'm merging #6908 and closing this one as a duplicate rather than asking you to rebase around it. Appreciate the report and the Docker-side repro — that's genuinely useful confirmation the fix also resolves the container boot crash, not just the CLI dist.

[diegosouzapw]

Thanks for catching this — same root cause and same fix as #6908, which landed a slightly more thorough regression test (exercises the real copy function against a temp dir rather than string-matching the source). Both patches touch the identical EXTRA_MODULE_ENTRIES lines and would conflict, so I merged #6908 and am closing this as a duplicate. Appreciate the report and the Docker-side repro.