Fix critical bugs in hook dispatch, response status, resource cleanup, and instance isolation

[Copilot]

Seven bugs fixed across the core request/response lifecycle that affected correctness and robustness of the HTTP server.

Bug fixes

• _executeHooks hardcoded to _init — executeGroupHooks() iterated _init instead of the hooks parameter, so shutdown and error hooks never fired for group-scoped routes
• Response.json() ignored status param — accepted status but never assigned it to this.status
• Missing await on OPTIONS hook execution — async _executeHooks call was fire-and-forget
• _extractBoundary case-sensitive header lookup — checked 'Content-Type' but Shelf normalizes to 'content-type', breaking multipart parsing
• resetResources only called on 404 path — per-context resources leaked on successful and OPTIONS requests; restructured run() to always clean up
• _supervisors was a module-level global — all Http instances shared one list; moved to instance field
• Router missing HEAD in _routes map — inconsistent with Http._routes which includes it

Tests

10 new unit tests covering Response methods (status propagation, headers, cookies) and Http behavior (group hook dispatch, 404 handling, supervisor isolation).

Warning

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Original prompt

corner code fix any issues and make it complete and robust library to build http servers

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