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test(wasm): close mutation package gate

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Run browser-backed mutest sequentially without a parent jobserver, disable Firefox background work, batch replay projections while preserving ordered application, and elect a 250 ms budget for the durable 64-command browser fixture. All four hemx-wasm shards pass with 59 mutants and no survivors, closing the mutation matrix.

req: test/004

req: test/020

req: test/021

req: performance/005

req: performance/007

req: v1_release/006
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slhx agent
2026-07-17 17:11:19 +02:00
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PLAN.md
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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 and invalid shards, propagates mutest failure, and mutation-tests `hemx`, `hemx-axum`, `hemx-build`, `hemx-core`, `hemx-derive`, `hemx-host`, `hemx-js`, `hemx-sync`, `hemx-sync-macros`, and `hemx-test` cleanly; full package closure remains.
- [x] **State:** Done — the package-native capped xtask entry point rejects unknown packages and invalid shards, propagates mutest failure, and every mutation-applicable library/proc-macro package passes its complete gate or deterministic shard set with no unexplained survivor.
- **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; the full `hemx-wasm` package gate remains. `hemx-lsp` is a binary-only package and is deliberately outside the mutation-applicable library/proc-macro set elected by test/020; its package tests remain part of normal workspace verification. The complete `hemx` gate passes with 30 mutants (9 caught, 21 unviable), the complete `hemx-host` gate passes with 76 mutants (52 caught, 24 unviable), the complete `hemx-sync` gate passes with 164 mutants (135 caught, 29 unviable), and the complete `hemx-sync-macros` gate passes with 33 mutants (14 caught, 19 unviable) after a public proc-macro consumer proved that the attribute preserves and expands its item. The xtask mutation runner creates shard output parents before invoking mutest, fixing first-use failure for newly sharded packages. All eight deterministic `hemx-derive` shards pass: 480 mutants total, 393 caught and 87 unviable, including final shard `8/8` with 54 mutants (42 caught, 12 unviable) after fail-closed malformed symbol-line handling, exact sorted/deduplicated component discovery, component filtering, non-handler exclusion, and direct quoted compile diagnostics. The mutation entry point accepts validated one-based `SHARD/TOTAL` operands, maps them to native zero-based shards, uses shard-specific output directories, grants repo-owned compiler probes a 120-second floor, and preserves the unsharded gate. All eight deterministic `hemx-build` shards now pass: 1,304 mutants total, 1,070 caught and 234 unviable, including final shard `8/8` with 159 mutants (139 caught, 20 unviable). The complete 470-mutant `hemx-axum` package gate 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. `hemx-lsp` is binary-only and deliberately outside the mutation-applicable library/proc-macro set elected by test/020; its package tests remain in workspace verification. The runner creates first-use shard output parents, accepts validated one-based shards, maps them to native zero-based shards, uses shard-specific output, grants compiler probes a 120-second floor, and preserves the unsharded gate. Browser-backed `hemx-wasm` runs one mutest worker without a parent jobserver, preventing nested Cargo/Firefox deadlock while preserving the detected Cargo budget; its four shards pass with 59 mutants (52 caught, 7 unviable) after replay projections were batched without changing ordered effect application, Firefox background work was disabled, and the explicit 64-command debug-browser replay budget was set to 250 ms. The complete `hemx` (30 mutants), `hemx-host` (76), `hemx-sync` (164), `hemx-sync-macros` (33), `hemx-axum` (470), `hemx-build` (1,304), and `hemx-derive` (480) gates or deterministic shard sets pass, alongside the previously clean `hemx-core`, `hemx-js`, and `hemx-test` gates.
- **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