docs: missing_docs sweep — 0 warnings + deny gate + publish-prep decisions (HY-02, HY-04, HY-11)

- document every public-API item across 18 files (openapi_spec model,
  HttpAuthScheme/HttpServiceConfig, HttpClientBuildError + SharedHttpClient
  accessors, RetryAfterMiddleware, GatewayDispatch, gateway error
  mapping, CallRequest/SchemaQuery/SubscribeStream, HttpAdapter +
  ALPNs + builders, decoy/healthz/state, WsSessions/WsPumps,
  from_openapi/from_jsonschema/from_mcp/from_wss/to_mcp, lib.rs module
  docs)
- enforcement: #![deny(missing_docs)] at crate root — stronger than CI
  rustdocflags (every build incl. cfg(test), where rustdoc misses the
  test-support module docs)
- HY-10 (opportunistic): all 8 docs.rs/alkhttp placeholder ADR links +
  the one relative ../docs link converted to plain text; the 10
  pre-existing private/redundant intra-doc-link warnings fixed —
  RUSTDOCFLAGS="-D warnings" cargo doc is fully clean
- HY-11 decision: docs/ + tasks/ excluded from the published package
  (contributor-facing design/process material; ADR references degrade
  to plain text uniformly). cargo publish --dry-run: 38 files, ~889 KiB,
  zero docs/ or tasks/ entries
- HY-04 decision: keep + document — frame_channel0_chunk's unwrap is
  on serializing the acyclic EventEnvelope (unreachable failure);
  # Panics on it and the adjacent WsClient senders state the contract

Verified: cargo test (299 + 5 TLS), --all-features (370 + suites),
--no-default-features (299), clippy --all-targets -D warnings
(default + all-features), fmt --check, cargo doc -D warnings clean,
cargo publish --dry-run --allow-dirty clean.

Tasks: review-001-missing-docs-sweep (final pending task; 42/42)

src/websocket/mod.rs

@@ -1,11 +1,11 @@
 //! WebSocket subsystem: the browser bidirectional path
-//! ([ADR-067](../docs/architecture/decisions/067-websocket-carries-channels.md)).
+//! (ADR-067, `docs/architecture/decisions`).
 //!
 //! A WS session carries the **channels protocol**: the 8-byte chunk
 //! header multiplexes N logical channels over the WS binary message
 //! stream; channel 0 is pre-negotiated as `alk/call` and dispatched by
-//! the shared `Dispatcher`. The WS↔byte-stream adapter
-//! ([`byte_adapter`]) is the single seam between axum's WS and
+//! the shared `Dispatcher`. The WS↔byte-stream adapter (`byte_adapter`)
+//! is the single seam between axum's WS and
 //! alkcall's byte-oriented channels machinery — shared with the
 //! `from_wss` consumer path ([ADR-070]).