test: make eight omowright assertions able to fail

[code-yeongyu]

Summary

This PR changes eight omowright tests (lane omowright) so their assertions can fail, and removes the probes that already had stronger owners. Each repair has a mutation proof below.

Candidates (lane omowright)

Title	Mark	Keeper
Source grep of the MV3 background.js (bridge-transport.test.mjs, "extension protocol errors use a dedicated response name and reconnect indefinitely")	F	The repaired test runs the real background.js in node:vm against a fake chrome. It checks that an unknown command is answered as protocolError, that the capped backoff keeps reconnecting past six attempts, and that the hello lists equal COMMAND_NAMES/EVENT_NAMES.
protocolError collision check compares two literals	F	COMMAND_NAMES.includes("protocolError") === false
Un-awaited assert.rejects in agent-tabs	F	The disposed-create rejection is now awaited.
Test names promise order and timeout behavior that is never asserted	F	The fake attachPage records itself, so activate-before-attach is asserted. The close test is renamed to what it checks, and its duplicated capability assertion goes; close failure leaves target owned... keeps timeout retention.
normalizeDialogPolicy identity-copier test	C	A function-policy row in object dialogPolicy can dismiss and supply promptText, next to PipeCdpClient default dialogPolicy auto-accepts
Machine-local install check in skill-docs	D	skill-docs.test.mjs: the in-repo frontmatter-name and referenced-doc-path tests
typeof probes inside real tests (integration + cloak-profile)	D (lines only)	frames-snapshot and interaction tests click ref locators for real; cloak-profile calls the function on the next line
Vacuous toast assertion in layers	F	Only blocking === null remains, with the message of the contract it enforces.

Deferred: none.

Baseline gate (unedited base 13567bbc)

The seven touched files, in both runners: bun 63 pass, 0 fail; node --test 63 tests, 63 pass. After this change: bun 61 pass, 0 fail; node 61 tests, 61 pass.

Mutation proofs

In each case the production owner was mutated, the repaired test was run, and then the owner was restored. git diff --quiet -- src bridge exits 0 afterwards.

• MUT-R176a responseName falls back to a real command. New test: 0 pass 1 fail. Old test: 1 pass 0 fail
• MUT-R176b reconnect stops after six attempts. New test: 0 pass 1 fail. Old test: 1 pass 0 fail
• MUT-R92 protocolError added to COMMAND_NAMES. New test: 0 pass 1 fail
• MUT-R93 disposed guard removed. New test: 0 pass 1 fail
• MUT-R94 activation moved after attach. New test: 0 pass 1 fail. Old test: 1 pass 0 fail
• MUT-R140 function policies not passed through. New test: 0 pass 1 fail. Old test: 1 pass 0 fail

Audit numstat (frozen measurement tool, merge-base..head)

Removed: test 37, support 0, prod 0. Added: test 40, support 0, prod 0. Test files delta: 0.

Validation

Full suites on a clean checkout of this commit on a local macOS arm64 machine:

• bun run test: 217 pass, 0 fail
• bun run test:node: 217 tests, 217 pass
• git diff --check: clean

Refs #28

---

Summary by cubic

Repairs eight omowright test assertions so they can actually fail, and removes redundant probes that weaker assertions masked.

• bridge-transport.test.mjs now runs the real background.js in node:vm against a fake chrome, asserting the protocolError response name, reconnects past six attempts, and hello lists matching COMMAND_NAMES/EVENT_NAMES; the collision check now asserts COMMAND_NAMES excludes protocolError instead of comparing two literals.
• agent-tabs.test.mjs awaits the disposed-create rejection, records the fake attachPage so activation-before-attach is asserted, and narrows the close test to what it checks.
• dialogs.test.mjs folds the normalizeDialogPolicy identity cases into the object-policy test as a function-policy row.
• Removes the machine-local install check in skill-docs.test.mjs, two typeof probes (integration, cloak-profile), and a vacuous toast assertion in layers.test.mjs.

^{Written for commit 03d786f. Summary will update on new commits.}