repo: incidental-complexity sweep (−1.9k LOC)

[lannbot]

Adversarial review for incidental complexity across the whole tree, then execution of every finding. Five parallel reviewers over disjoint territories; every deletion verified against repo-wide usage (consumers, generated code, CI) before removal. Net: +614 / −2386.

Dead code (verified zero callers)

• deferredCapability, setMaxFlatResultsForTesting (+ MAX_FLAT_RESULTS now const), containsAsyncValue, NO_EVENT, isBulkListKind — orphans of the PR embedder: structured-clone-safe boundary forms (A20, #131) #219 window
• no-op try/catch in translateCached (both branches rethrew unmodified)
• tools/browser/gen-overlay.ts (no invoker; classifier frozen at closed M3A-1)
• tools/smoke-c0/repro_stream_pump.ts + repro task (fixed bug, superseded by host_pump_test.ts)
• duplicate debug-id minting in intrinsics unified onto dbgId (trace ids now correlate across probes)

Speculative hedges

• sockets platform seam: optional-capability members made required — the seam has one backend and it implements all of them; one dead fallback would have livelocked a guest (would-block instead of not-supported) if ever reachable. Option-honesty not-supported paths preserved.
• cli({ passthrough }) — set by nobody, buggy (newline-injecting)
• http({ version }) rc re-keying — only caller was its own test with a fabricated version; the manual re-key escape remains documented
• sync() accessor-property branch — hedged an input the producer never produces
• digest structural-diff machinery — unreachable from the real handshake (bindgen embeds only the hash, firstDivergence always null); contracts/digest.md amended to the behavior that ships: fails fast on mismatch. Codegen comment fixed + six generated headers regenerated (comment-only delta).

Surface trims (the breaking labels)

• runtime: @internal version/casing parser exports off ./embedder (parseLeafName, parseSemver, trackKey, …); DigestMismatch.firstDivergence field removed
• wasi: CliOptions.passthrough, HttpOptions.version removed
• ct-runner: @internal re-exports (Context/tags/TESTS_INTERFACE…) and the ./imports + ./run subpaths removed; ImportAnalysis kept (return type of public analyzeImports)
• protocol: RUNTIME_COPIES un-exported (own doc: @internal; the contract's example uses Symbol.for)

Versions: lockstep 0.5.2 → 0.6.0 (+ RUNTIME_VERSION), protocol 0.2.4 → 0.3.0. Conventions goldens byte-identical.

Consolidation

• protocol mark-decorator triplication → module-private makeMark (exports, messages, behavior byte-identical; tests unchanged)
• bindgen CLI: bare-vs-generate-subcommand duplication deleted (bare form kept — the one generated headers document)
• wit-bindgen-core dependency dropped: its only use was Source as a string buffer; replaced with a snapshot-verified byte-identical local buffer, freeing wit-parser to pin =0.252.0 alongside translator-shim's wasmparser and deleting the 28-line pin-pairing essay

Fixtures / config / docs

• yield-only + backpressure-probe guests deleted (built every CI run, consumed by no test)
• harness/deno.json browser:* tasks + dead exports map removed (lanes run via just browser-lane)
• AGENTS.md gates listing collapsed onto the justfile (it had drifted: missing three recipes)
• stale sync-streams upstream filing kit dropped (pin advanced past its base; tracker File the upstream findings (IROH-1; component-model tracker) #15 untouched)
• deletion-event archaeology (CM#705/pin-advance migration map: CM#705 removes the may_enter flag/trap #173 and older series) rewritten as forward rationale or removed across runtime and xfail.ts — per operator directive, zero documentation of deletion events

Gates

Full just gates green over the final tree (core suites through conformance/sched-seeds/shells in one run; browsers/smoke-tls/smoke-c0 after a one-time just browsers-install in this worktree). test-npm caught one reviewer miss — the consumer smoke probed the removed ct-runner/run subpath — fixed by dropping the stale probe entry.