feat(codemode): label self-hosted compiled binaries as native in eval runtime badges

[code-yeongyu]

Summary

When a compiled standalone binary hosts the eval JS kernel itself (an omo/pi native build, e.g. omob), the eval header runtime badge now reads native instead of bun:

• before: eval js (bun 1.4.0, ~/.omo/binary-runtime/5.0.0-.../omo)
• after: eval js (native 1.4.0, ~/.omo/binary-runtime/5.0.0-.../omo)

The in-process JS kernel always runs on process.execPath; under a compiled binary that path IS the application binary, so labeling it bun was misleading. Detection mirrors the existing precedent in packages/coding-agent/src/config.ts: the module url of a compiled bun binary carries $bunfs / ~BUN / %7EBUN virtual-filesystem markers. No Bun-only APIs (package invariant), injectable signals for tests.

Deliberately unchanged:

• stock bun runs keep bun <ver>, <path> and node runs keep node <ver>, <path>
• the eval prompt host line stays bun <ver> — the model needs the engine capability surface, not the install identity (jsRuntimeLabel now passes nativeSelf: false explicitly)

Changes

• src/extension/runtime-info.ts: isNativeSelfRuntime(signals) + jsRuntimeInfo(..., nativeSelf) third param (defaults to detection); doc comments
• tests: runtime-info native/edge matrix, runtime-label native badge pin, eval-render native header pin
• README + CHANGELOG [Unreleased]

QA evidence (real surface)

Compiled a standalone probe binary with bun build --compile importing the real runtime-info.ts + runtime-label.ts:

execPath=/private/tmp/ulw-native-badge-qa/probe-native
nativeSelf=true
runtime={"name":"native","version":"1.4.0","path":"/private/tmp/ulw-native-badge-qa/probe-native"}
header=eval js (native 1.4.0, /private/…/probe-native)

Stock bun control run of the same script (bun 1.4.0):

execPath=/Users/yeongyu/.bun/bin/bun
nativeSelf=false
runtime={"name":"bun","version":"1.4.0","path":"/Users/yeongyu/.bun/bin/bun"}
header=eval js (bun 1.4.0, ~/.bun/bin/bun)

• packages/senpi-codemode vitest suite green; root npm run check green (transcripts captured)
• TDD: native cases captured RED (expected 'native', received 'bun'; false ≠ true marker matrix) before implementation

---

Summary by cubic

Labels the eval header runtime badge native when a compiled standalone binary hosts the JS kernel itself, instead of the misleading bun.

• Detection trusts a Symbol.for("@earendil-works/pi-coding-agent:compiled-binary-host") signal published by the coding-agent binary loader, with anchored $bunfs/~BUN module-url shapes as fallback; the host signal is needed because sidecar extensions load from disk and carry no marker.
• isBunBinary detection in packages/coding-agent is now anchored to the exact virtual-filesystem URL shapes so a stock bun run from a disk path containing a marker segment no longer misclassifies as compiled.
• Stock bun and node badges and the eval prompt host line are unchanged.

^{Written for commit bfaa8fd. Summary will update on new commits.}

[code-yeongyu]

ultrabrain review (round 3) — VERDICT: APPROVE

Reviewer: ultrabrain category (quotio-openai/gpt-5.6-sol:xhigh), 3 review epochs, two REQUEST_CHANGES rounds fixed and re-verified.

The round-2 delta closes the remaining production blocker. isBunBinary now uses the anchored isCompiledBunBinaryUrl() predicate, so marker-infix stock Bun paths no longer enter the loader's compiled-host branch; the loader signal, codemode detection, sidecar behavior, native badge, and unchanged bun prompt label are all consistent end to end.

Verification performed: detector + blast-radius tests 13 passed; senpi-codemode suite 651 passed; runtime/render regression tests 41 passed; root tsc, Biome, dependency/lock/changelog gates all green; independent compiled-Bun smoke confirms embedded URLs classify compiled, marker-infix disk paths do not, sidecar URL alone stays bun, host signal produces native; git diff --check clean.

Non-blocking notes: none.

[code-yeongyu]

ultrabrain review (round 3) — VERDICT: APPROVE

Reviewer: ultrabrain category (quotio-openai/gpt-5.6-sol:xhigh), 3 review epochs, two REQUEST_CHANGES rounds fixed and re-verified.

The round-2 delta closes the remaining production blocker. isBunBinary now uses the anchored isCompiledBunBinaryUrl() predicate, so marker-infix stock Bun paths no longer enter the loader's compiled-host branch; the loader signal, codemode detection, sidecar behavior, native badge, and unchanged bun prompt label are all consistent end to end.

Verification performed: detector + blast-radius tests 13 passed; senpi-codemode suite 651 passed; runtime/render regression tests 41 passed; root tsc, Biome, dependency/lock/changelog gates all green; independent compiled-Bun smoke confirms embedded URLs classify compiled, marker-infix disk paths do not, sidecar URL alone stays bun, host signal produces native; git diff --check clean.

Non-blocking notes: none.