test(axum): close package mutation gate

Exercise every state, typed-form, async, and result registration family; replace fallible numeric headers with typed HeaderValue construction; and classify only validated equivalent multipart/header mutants.

req: axum_integration/003

req: derive_handler/005

req: multipart/003

req: test/020

req: test/021

req: test/022
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slhx agent
2026-07-17 01:50:16 +02:00
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## 2. Make mutation testing a reproducible release gate
- [ ] **State:** In progress — the package-native capped xtask entry point is reachable, rejects unknown packages, propagates mutest failure, and mutation-tests `hemx-core`, `hemx-js`, and the full `hemx-test` package cleanly; full package closure remains.
- [ ] **State:** In progress — the package-native capped xtask entry point is reachable, rejects unknown packages, propagates mutest failure, and mutation-tests `hemx-axum`, `hemx-core`, `hemx-js`, and the full `hemx-test` package cleanly; full package closure remains.
- **User value:** maintainers can run one bounded repository command and trust that meaningful Rust logic across every mutation-applicable library is either killed or explicitly justified.
- **Build:** add a capped `hemx-xtask` mutation command that invokes `/opt/repositories/mutest`/`mutest` through package-native test targets rather than the broken workspace-wide example path; enumerate only current mutation-applicable library/proc-macro packages; finish adversarial tests or simplify code until every survivor is classified; keep equivalent, invariant-only, and infrastructure-inapplicable classifications inspectable and minimal; document the exact local release command in the existing readiness surface.
- **Blocked by:** none; broad survivors currently remain in `hemx-axum`, `hemx-build`, `hemx-derive`, and `hemx-lsp` outside already-clean focused contracts; the current `hemx-axum` frontier now proves page-mode, response constructors, form accessors/rejections, media-type limits, multipart success/error semantics, sync/async registry dispatch, effect/rejection responses, and embedded runtime delivery mutation-clean; page extraction/response, media-type integration, partial-constructor defaults, missing multipart-boundary rejection, and root-fingerprint injection are now mutation-clean; handler-registration and infallible runtime-header construction remain before the full package gate can pass.
- **Blocked by:** none; broad survivors currently remain in `hemx-build`, `hemx-derive`, and `hemx-lsp` outside already-clean focused contracts. The complete 470-mutant `hemx-axum` package gate now passes with 262 caught and 208 unviable after public page/form/multipart/registry/response/runtime proofs and narrow classification of infallible header parsing and streamed multipart unwrap-equivalent mutants.
- **Proof:** the new xtask mutation command exits zero within its documented bound, covers each applicable package, emits no unexplained missed mutant, and a deliberate adjacent mutation makes it fail. `cargo run -p hemx-xtask -- test` remains green. req: test/020 req: test/021
## 3. Elect and enforce the release license policy