Move to stable Effect 4.0.x (0.6.0)

[tamashi095]

Summary

Refs #131 (issue + numbered spec .github/ISSUE_SPECS/131-move-the-web-adapter-to-stable-effect-4-0-x.md).

Moves @misofm/engine-web-adapter from effect@4.0.0-rc.112 to stable Effect 4.0.x (0.5.13 -> 0.6.0). Not tagged, not published. Depends on the published @misofm/codec@0.2.0 (misofm/codec#9, release https://github.com/misofm/codec/releases/tag/v0.2.0).

• effect moves from a hard dependency (4.0.0-rc.112) to a peer dependency >=4.0.3 <4.1; dev dependency pinned exactly to 4.0.4 (the adapter uses no @effect/* package; Effect 4.0.4 has no runtime dependencies). This is the actual fix for the crash: with a hard dependency the adapter's rc.112 runtime ran Layer.build(makeFlacDecoderLayer(bytes)) built by the application's 4.0.x codec copy and threw Cannot read properties of undefined (reading 'scheduler').
• effect/unstable/http -> effect/http (3 files). tsc needed no other source change; the built .d.ts differ from 0.5.13 only in that one import line in stems/sparse-response.d.ts.
• @misofm/codec is the exact published 0.2.0; package-lock.json resolves the registry tarball with its integrity (sha512-nbhiEKPB…ksUmqGA==) and no git URL remains. scripts/check-package.mjs asserts it, and the release workflow asserts dependencies['@misofm/codec'] == 0.2.0, the peer range, and the same on the registry artifact.
• Behaviour changes (see CHANGELOG.md): the sparse full GET now disables HttpClient.TracerPropagationEnabled like the FLAC range lane (no b3/traceparent headers, which forced a CORS preflight; the new test fails without it); non-enumerable/symbol extra keys on sparse expectations and spans are rejected again via Reflect.ownKeys preflight, as in rc.112 (Effect #8423 strips them under 4.0.x; two new tests fail without the fix); a cancelled FLAC range read's nested cause may carry one extra AbortError (cause shape Fail, Interrupt vs Fail; public error unchanged).
• Browser gate scripts no longer copy fast-check/pure-rand/msgpackr (Effect 4.0.x does not install them; the scripts failed on missing directories).
• Adds CHANGELOG.md (shipped in the package) with behaviour notes and the migration note; npm-publish.yml version 0.6.0; check-package.mjs asserts the new dependency shape.

Verification (local, Linux, Node 22.23.2)

• npm ci --ignore-scripts from the committed lockfile and npm run check (re-run on the final head against the registry codec) (format, SHA-256 and BLAKE3 Wasm reproducibility with pinned Emscripten 6.0.9 / Rust 1.97.1, typecheck, source policy, decoder asset policy, build, 383 tests, 0 fail, package policy: 248 files): passed. Same suite also pass with effect@4.0.3 installed (peer floor).
• Packed Chromium 151 consumer, real OPFS, FLAC decoded in a Worker: npm run test:browser and node scripts/browser-packed.mjs --indexed-sparse passed; npm run test:browser:opfs Chromium part passed.
• Not run locally: WebKit (Linux WebKit 26.5 has no FileSystemFileHandle; identical failure on unchanged origin/main, so the WebKit lanes rely on the macOS workflow below); test:browser:live (needs fixed port 5173, in use on this machine, and the live stems host); Firefox (no lane in this repo).
• Crash repro, consumer with effect@4.0.4: @misofm/codec@0.1.1 + @misofm/engine-web-adapter@0.5.13 (nested effect@4.0.0-rc.112) -> loadFlacDecoderModule fails with TypeError: Cannot read properties of undefined (reading 'scheduler'). With the registry codec 0.2.0 + this branch's packed adapter 0.6.0 -> succeeds (npm install --strict-peer-deps valid, npm ls exit 0, single effect@4.0.4). effect@4.0.3 also valid; effect@4.0.0-rc.115 is rejected with ERESOLVE.
• CI: only opfs-qualification.yml runs on PRs (macOS, Chromium + WebKit OPFS, three warm workers); there is no PR workflow for npm run check, which was run locally as above.

Release

Merge, then run Publish @misofm/engine-web-adapter (workflow_dispatch on main: mode=publish, expected_sha=<40-char merge SHA>). OIDC trusted publishing, no token fallback; it runs npm run check, refuses an existing version, publishes, then verifies the registry artifact (including the codec and peer pins).

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