Completes the contributor profile: #12198 stopped OmniRoute from assembling the standalone bundle, but Next was still asked to emit one. Making output: "standalone" conditional on OMNIROUTE_BUILD_PROFILE=contributor removes the standalone tracing pass itself, which is where the remaining time went.
Default builds are unaffected — the flag is read from the env at config load and is false everywhere except the contributor profile, so tests/unit/next-config.test.ts still observes output === "standalone" (18/18 green across contributor-build-script, next-config and build-profile-stubs).
Reconciled on merge: CONTRIBUTING.md and scripts/build/backendOnlyPages.mjs already carried this stack's earlier steps on the tip, so both took the tip's side; only the next.config.mjs conditional and its test are this step's delta.
Thanks @rafacpti23 for splitting this into four reviewable steps — it made the whole stack easy to reason about.
Contributor builds only need compilation to type-check; pulling src/instrumentation.ts drags the whole startup graph (DB boot, model-catalog warm, quota fetchers) into the build. stubContributorInstrumentation() swaps both entrypoints for no-ops before next build and hands them to the existing restoreDashboardPages() path afterwards, reusing the same {file, original} shape and the SIGINT/SIGTERM handlers already registered in that block.
Reconciled on merge: the stub originally wrote 'export async function register() {}' into both files, but src/instrumentation-node.ts exports registerNodejs() (register lives in src/instrumentation.ts). Harmless in practice — instrumentation.ts is its only importer and is stubbed at the same time — but the stub misstated the file's contract, so it now emits the right symbol per file and the test asserts it.
Verified: contributor-build-script 3/3 green.
Thanks @rafacpti23.
Makes the contributor profile actually fast: with OMNIROUTE_BUILD_PROFILE=contributor the build stops after next build instead of copying docs/ and running assembleStandalone, which is the expensive half and produces an artifact contributors never ship. Adds isContributorBuild() next to the existing isBackendOnlyBuild() and documents the compile-only contract in CONTRIBUTING.md.
Reconciled on merge: CONTRIBUTING.md's new paragraph was inside the ```bash fence and would have rendered as shell — moved below the closing fence. package.json auto-merged against the tip.
Verified: contributor-build-script + backend-only-smoke-workflows 10/10 green.
Thanks @rafacpti23.
The contributor profile added in #12192 inherited the default Turbopack bundler. Turbopack's native allocator is the documented OOM risk on memory-constrained machines (scripts/build/build-next-isolated.mjs:201-202), and OMNIROUTE_USE_TURBOPACK=0 is the escape hatch the same script already honours at line 139 — the repo's own nightly-compat workflow pins it to "0" for exactly this reason. Setting it on build:contributor makes the fast profile usable on the machines it targets.
Reconciled on merge: the branch was 51 commits behind and #12192 had already landed the script line, so only the env flag is new; the tip's dependency block was kept verbatim rather than taking the stale package.json wholesale.
Verified: tests/unit/build/contributor-build-script.test.mjs 1/1 green.
Thanks @rafacpti23.
