fix(tests): isolate native Claude home, settle IPC contenders, select pack entries by name

[ScriptedAlchemy]

Summary

Three test-isolation fixes, each fixed at source (no retries, no padding, no longer timeouts):

1. native-claude-contract.test.ts — every enabled runNativeClaudeSmoke now receives an isolated homeDirectory (withIsolatedHome, mkdtemp + cleanup). Five tests previously ran with environment: {} / no homeDirectory, so resolveClaudeNormalHome fell back to os.homedir() and digested the developer's real ~/.claude (2.1 GB / 7,479 files on this machine) before and after every stubbed run. The "fails closed when the candidate plugin…" case runs three smokes (six digests) and timed out at 5 s wherever the claude CLI is installed.
2. event-ipc.test.ts — the three contender-race tests (does not unlink a concurrent winner…, serializes concurrent reclamation…, excludes a second orphan-claim remover…) now attach the settlement handler to the losing server promise the moment it is created (settleContender). Root cause: the loser rejects Event runtime endpoint already has a live server. as soon as the winner listens (≤ 10 ms retry loop), while the test only reached its await secondServer after the winner had fully resolved (listen + chmod + stat + Effect layer plumbing). On a loaded machine the rejection landed first and surfaced as an unhandled, file-level failure ("fullName": "", stack in claimEndpoint) — the exact signature seen in prior pnpm test:unit runs under concurrent lanes. Endpoint ids are crypto.randomUUID() so there is no cross-run socket-path collision to isolate; the shared /tmp was only the load source. A copy of the file with a forced 200 ms gap between winner resolution and the loser await reproduced the failure deterministically before the fix and passed after it.
3. npm pack --json entry selection — packOutputFromJson (src/build/pack-inventory.ts + the scripts/npm-pack-json.mjs mirror) accepts a packageName and selects the entry by npm name instead of by position; without a name it still requires exactly one entry. scripts/run-packed-tests.mjs, scripts/audit-packed-release.mjs, tests/support/shared-pack.ts, tests/support/packed-native-smoke.ts, packed-consumer.test.ts, and cli.test.ts pass agent-bundle / @agent-bundle/runtime / create-agent-bundle, so a workspace-aware pack that lists sibling packages still resolves the intended tarball. Unit coverage added in prepack.test.ts (array + package-keyed shapes, name-less npm 12 objects, 0/2 match errors).

Evidence

Machine: claude on PATH (/home/zack/.local/bin/claude), other lanes running tests concurrently.

Item	Before	After
native-claude-contract	1 failed: fails closed… → test timed out in 5000ms; file wall 16.5 s	17 passed / 1 skipped, tests 681 ms, file wall 1.8 s; 10/10 loop runs green (wall 1.82–2.07 s each)
event-ipc	prior test:unit logs: file-level EventRuntimeTransportError: Event runtime endpoint already has a live server. with "fullName": "" (5 separate runs on record); deterministic repro via 200 ms gap copy → same signature	200 ms-gap copy passes; 10/10 sequential loop green; two concurrent runs of the file both green (16/16 each); 8 concurrent runs green
packed-native-smoke	pnpm build && pnpm test:packed:native on this machine: 6 passed / 1 skipped (35.8 s) — the 4-entry npm pack --json output did not reproduce with npm 12.0.2 here, so the fix is by construction + unit-tested	6 passed / 1 skipped (27.4 s); 10/10 pnpm test:packed:native loop green (wall 23.7–28.0 s each, opt-in test skipped, Claude plugin proof passing); prepack.test.ts 10/10 incl. new name-selection test

The isolated "fails closed…" case alone now runs in 179 ms (-t filtered run) versus the former 5 s timeout.

Gates: pnpm typecheck ✅ (6.8 s), pnpm lint ✅ (0 errors / 0 warnings, 1161 files), pnpm test:unit ✅ 204 files, 3003 passed / 5 skipped / 0 failed (44.8 s).

Test plan

• pnpm exec rstest --config rstest.unit.config.ts packages/agent-bundle/tests/native-claude-contract.test.ts (with claude installed) — < 2 s, green.
• Launch packages/agent-bundle/tests/event-ipc.test.ts twice in parallel — both green.
• pnpm build && pnpm test:packed:native — reaches harness setup, opt-in test skipped, Claude plugin proof passes.
• AGENT_BUNDLE_WORKBENCH_PREBUILT=1 AGENT_BUNDLE_PACKAGE_PREBUILT=1 pnpm exec rstest --config rstest.integration.config.ts packages/agent-bundle/tests/prepack.test.ts — green.

Review status

• CI: all required checks green on head c511d01cd6bbabed1bf96df3db21af27b7a90239 (Changeset present, Dependency review, Docs site, Examples check, Host install proofs, RSC runtime micro-eval, Release gates, Verify (Node 24), pkg.pr.new preview).
• chatgpt-codex-connector: three requests (automatic on open at 16:51Z, @codex review at 16:52Z and 17:11Z) all answered "You have reached your Codex usage limits for code reviews". No review threads were opened.
• Last codex-reviewed SHA: none. Unreviewed SHAs: 93bd86ea7 (fix), c511d01cd (changeset PR reference; head). Merged on CI green per the standing rule; a follow-up PR will answer any threads codex raises later.

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🦋 Changeset detected

Latest commit: c511d01

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
agent-bundle	Patch

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[ScriptedAlchemy]

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[pkg-pr-new]

npm i https://pkg.pr.new/ScriptedAlchemy/agent-bundle@432

npm i https://pkg.pr.new/ScriptedAlchemy/agent-bundle/create-agent-bundle@432

npm i https://pkg.pr.new/ScriptedAlchemy/agent-bundle/@agent-bundle/runtime@432

commit: c511d01

[ScriptedAlchemy]

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