test(build): close placement diagnostic mutants

Assert exact InvalidData diagnostics for navigation, boost, client-module, and SSE misplacement and prove each accepted placement through AppBuilder::run.

req: page_swap/001

req: page_swap/007

req: push/006

req: diagnostics/002

req: test/021
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slhx agent
2026-07-17 06:07:04 +02:00
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- [ ] **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-build`, `hemx-derive`, and `hemx-lsp` outside already-clean focused contracts. The current `hemx-build` frontier now also mutation-proves all 31 loop-local inference mutants: only one Rust identifier bound directly to a `self` vector field yields facts, malformed/non-vector bindings fail closed, unknown element types preserve an empty local, and repeated locals deduplicate. The remaining package frontier starts at placement/attribute diagnostics. 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.
- **Blocked by:** none; broad survivors currently remain in `hemx-build`, `hemx-derive`, and `hemx-lsp` outside already-clean focused contracts. The current `hemx-build` frontier now also mutation-proves all 59 placement-diagnostic mutants with exact `InvalidData` paths, attributes, and guidance for navigation, boost containers, client modules, and SSE roots, plus their valid placements. The remaining package frontier starts at static attribute-value and keyed-scope diagnostics. 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