Add declarative response assertions and a controlled payload Runner #3

User problem

API testing needs repeatable expectations and a controlled way to try boundary values.

Acceptance criteria

• Check HTTP status, header presence/equality/content, JSON Pointer values, response text, time, and byte budgets.
• Save assertions with Builder, Repeater, and collection requests.
• Run assertions for every payload and display passed/failed counts plus per-result details.
• Run at most 50 payloads sequentially against one origin, with delays, timeouts and cancellation.
• Provide numeric, JSON type and string boundary presets, CSV results, replay and comparison.
• Fail assertions on network errors and clean temporary request rules after cancellation.

Implementation status

Implemented and verified in PR #1 on feat/v1.1-workbench. PR #1 was merged into main on 2026-10-03, merge commit eeb65009fa6e343cf6dd1f67386be0afc5bbb3e5. GitHub automatically closed this issue as completed through the PR's closing reference. The source changes are now on main; the Chrome Web Store release remains pending.

Verification

Node tests exercise assertion success/failure, JSON Pointer and network errors. Brave integration exercises Runner ordering, cancellation/timeouts, rule cleanup and Builder assertions.

Relevant source

lab.js, lab-ui.js, workflow-ui.js, dashboard.js, tests/lab.test.js

Related v1.1 work is tracked through PR #1. Follow-up improvements or bugs should use their own issue and PR.

Completion record

The implementation commits are 7b76001, 3ee1668, 4f1d89c, 504051e, and test follow-up 619736d. Relevant verification is described above and in PR #1. All 29 Node regressions and JavaScript syntax checks pass; GitHub CI passes on Node 22. The workbench/browser features were checked with isolated local HTTP/WebSocket fixtures; shortcut labels were also checked for Mac/Windows/Linux platforms. The maintainer merged PR #1, and GitHub closed this issue automatically; new bugs or follow-up scope should use a separate issue, or reopen this one if its original criteria fail.