docs(tasks): post-remediation sweep — 4 follow-up tasks

Found in the sweep of completed review-001 remediation:
- /publish schema validation fails open on compile error + recompiles
  per request (remediation-introduced, routes.rs:254-268)
- OAI-06 loud-degradation unblocked and still open (HTTP_0 marker)
- HY-06 ExponentialBackoff in public API + COV-02 mTLS success path
  both unblocked post client-config rework
- HY-02/04/11 publish-prep docs gate (104 missing-docs warnings
  re-measured)

Also flagged, not tasked here: WS-12 (alkcall demux 4 GiB discard
alloc) was never actually filed in alkcall's consumer-findings-ledger —
only CF-001 is there. File it when next touching alkcall.

taskgraph: validate clean (42), no cycles
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---
id: review-001-openapi-loud-degradation
name: Loud unsupported-OpenAPI-feature handling (OAI-06)
status: pending
depends_on: []
scope: narrow
risk: low
impact: component
level: implementation
tags: [adapters, review-001, from-openapi, follow-up]
---
## Description
Review 001 finding OAI-06 — deliberately deferred during decomposition
("revisit after the input-schema work"): unsupported OpenAPI features
still degrade **silently**, each producing an op that misbehaves only at
call time (verified still true post-remediation):
- `default`/wildcard response keys become
`ErrorDefinition { code: "HTTP_0", http_status: None }`
(`from_openapi.rs:build_error_schemas`, ~:238-243) — entries that never
match a real status.
- `trace` ops silently skipped (`openapi_spec.rs`); `servers` overrides
ignored; parameter `style`/`explode` unsupported and silent (arrays
serialize `"[1,2]"`); a `default`-declared SSE stream is missed by
`detect_op_type` and would return one giant text string.
Since OAI-03's fix, the codebase already has the right pattern —
`in: cookie` fails import with a clear `SchemaParse` naming the feature
and the remediation. Extend that posture: unsupported features that
would produce a wrong-behaving op **fail import loudly** (or degrade in
a way that is documented, tested, and visibly warned), never silently.
Per-feature decision, implementer's judgment with the review's map:
reject at import (cookie-style, preferred for anything that changes
wire semantics: `style`/`explode` non-default forms, `servers` override
on a non-matching base), or support (HTTP_0's real fix is mapping
`default` → a documented catch-all code or dropping it with a warning
— pick one and test it), or document-as-inert (`trace` skip is
defensible if logged).
## Acceptance Criteria
- [ ] A spec using each unsupported feature either imports with a documented, warned, tested behavior or fails import with a feature-naming error (tests per feature)
- [ ] `HTTP_0` no longer emitted (default responses mapped or dropped loudly) — `/search` never advertises a code that can't match
- [ ] `style`/`explode` non-default forms do not silently mis-serialize arrays
- [ ] `cargo test` and `cargo clippy --all-targets -- -D warnings` pass
## References
- docs/reviews/001-initial-implementation-review.md (Part E, OAI-06)
- tasks/adapters/review-001-input-schema-enforcement.md (the loud-unsupported pattern to extend)
## Notes
> Agent fills during implementation. Deferred from the original
> decomposition for staleness reasons; unblocked once OAI-02/03/07/09
> landed (they did). Scope guard: this is import-time fidelity, not
> new feature support — do not implement `servers` overrides or style
> serialization here.
## Summary
> Filled on completion.
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---
id: review-001-client-config-and-cert-coverage
name: Client config API cleanup (HY-06) + mTLS/CA-bundle test coverage (COV-02)
status: pending
depends_on: []
scope: narrow
risk: low
impact: component
level: implementation
tags: [client, review-001, follow-up, coverage]
---
## Description
Two deferred client-host items, grouped (same file, `src/client/http_client.rs`):
- **HY-06**: `HttpClientConfig.retry_policy` exposes
`reqwest_retry::ExponentialBackoff` in the public API (`:116`) — a
semver anchor to an upstream concrete type and an awkward construction
surface. The post-remediation config (RetryGate, TotalRetryBudget,
attempt counts, backoff bounds, budget deadline) is exactly why this
should now be an owned config struct (e.g. `max_retries`,
`max_retry_interval`, `initial_backoff`, `max_total_retry_duration`)
from which the middleware stack builds the internal backoff. Breaks
the public type — fine pre-publish; do it once, now, while the
surface is small.
- **COV-02 residue**: no test constructs a client with a working CA
bundle or client cert — only the missing-file error paths are tested
(`new_with_missing_ca_bundle_errors`). Post-remediation the
redirect/retry gates hang off this client, so the TLS-config paths
should be exercised: a test server with a self-signed cert + client
presenting its own cert, happy path through the full middleware stack.
## Acceptance Criteria
- [ ] `HttpClientConfig` no longer exposes `ExponentialBackoff`; owned field set covers what the remediation made configurable; module docs updated
- [ ] Existing config-construction call sites migrated (adapters' test fixtures included)
- [ ] TLS test: client built with a CA bundle connects to a private-roots server; client-cert path exercised end-to-end (COV-02's uncovered build paths)
- [ ] Feature matrix green (default, `--all-features`, `--no-default-features`)
- [ ] `cargo test` and `cargo clippy --all-targets -- -D warnings` pass
## References
- docs/reviews/001-initial-implementation-review.md (Part H, HY-06; Part I, COV-02)
- tasks/client/review-001-client-timeout-retry.md (the retry policy work this builds on)
## Notes
> Agent fills during implementation. Public-API shape change —
> coordinate with review-001-missing-docs-sweep if running concurrently
> (same module's docs).
## Summary
> Filled on completion.
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---
id: review-001-publish-schema-validation-robust
name: Fix /publish schema validation fail-open + per-request recompilation (post-remediation)
status: pending
depends_on: []
scope: narrow
risk: high
impact: component
level: implementation
tags: [gateway, review-001, follow-up]
---
## Description
Follow-up to review-001-gateway-publish-semantics (GW-01): the landed
fix compiles the op's `publish_schema` **on every `/publish` request**
(`src/gateway/routes.rs:254-268`) and, when compilation fails, logs a
warning and proceeds with **no validation** — chunks flow to the handler
unvalidated. Two remediation-introduced problems:
- **Fail-open on compile failure** — this reintroduces, conditionally,
the exact transport-dependent invariant GW-01 closed: a handler that
registered a `publish_schema` (or a remote import whose schema is
un-compilable by jsonschema 0.46's dialect) silently receives
arbitrary JSON over the HTTP path that the wire path would have
aborted. A registry with one broken schema becomes an unvalidated
ingest path with only a `tracing::warn` as the tell.
- **Per-request compile cost** — `jsonschema::options().build()` on the
hot path is CPU + allocation per publish call; a hostile or merely
busy caller multiplies it.
Fix direction (implementer's choice on mechanism): compile **once per
registration** — cache the compiled `Validator` (or the compile error)
against the op in the gateway state, invalidated on re-registration —
and make compile failure **loud and closed**: the request path surfaces
a server-fault (500, `INTERNAL`-class with the compile error logged at
error level), never a silent skip. Consider whether adapters can reject
un-compilable `publish_schema` values at import/registration time so
the failure lands before any traffic (adapter-side validation where the
schema originates), with the gateway cache as defense in depth.
## Acceptance Criteria
- [ ] Compiled validator (or error) cached per registration; no per-request recompile (test: compile count / perf shape not asserted, but code path is registration-keyed)
- [ ] Un-compilable `publish_schema` → request fails loudly (500/INTERNAL, error logged), chunks never flow unvalidated (test)
- [ ] Schema re-registration (hot reload) picks up the new schema (test)
- [ ] A `publish_schema`-registered Pub op still rejects an invalid chunk (existing GW-01 gate stays green)
- [ ] `cargo test` and `cargo clippy --all-targets -- -D warnings` pass
## References
- docs/reviews/001-initial-implementation-review.md (Part C, GW-01)
- tasks/gateway/review-001-gateway-publish-semantics.md (the landed fix + rationale)
- src/gateway/routes.rs:254-268 (the fail-open)
## Notes
> Agent fills during implementation. Found in the post-remediation
> sweep — not a Review 001 finding itself. Fail-open is the priority
> half; caching is the efficiency half. Registration-side (adapter)
> rejection at import is the preferred end state if alkcall's
> registration surface allows observing `publish_schema` at
> HandlerRegistration time.
## Summary
> Filled on completion.
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---
id: review-001-missing-docs-sweep
name: missing_docs sweep + publish-prep decisions (HY-02, HY-04, HY-11)
status: pending
depends_on: [review-001-client-config-and-cert-coverage]
scope: moderate
risk: low
impact: project
level: implementation
tags: [infra, review-001, docs, publish-prep]
---
## Description
The pre-crates.io documentation gate, deferred through the remediation
cycle so the API could stabilize first (it now has):
- **HY-02 [major]**: ~104 missing-docs warnings under
`RUSTDOCFLAGS="-W missing_docs" cargo doc --no-deps` (was 110 at
review time; the re-measure is current). Worst offenders were
`openapi_spec.rs` (28), `http_client.rs` (28), `forward.rs` (10),
`server/adapter.rs` (10), `dispatch.rs` (7), `routes.rs` (6); plus
`gateway/mod.rs` / `server/mod.rs` module docs. Sweep and make the
gate pass — better, enforce it (add `-D missing_docs` to
`RUSTDOCFLAGS` in CI or a `#![deny(missing_docs)]`-style lint config
the repo agrees on, so it cannot regress).
- **HY-11**: decide whether `docs/architecture/` (672 KiB) ships in the
published package (the `exclude` list currently keeps it, omits
`docs/reviews/`). If it ships, verify intra-doc links resolve on
docs.rs; if not, confirm ADR references in rustdoc degrade acceptably.
Record the decision in the task summary either way.
- **HY-04**: the `unwrap` inside shipped `test_support`
(`websocket/upgrade.rs:161`, behind the opt-in `test-support` feature)
is documented-as-intentional published API with a panic inside — make
the final call: keep (document on the public item) or restructure to
return `Result`.
Depends on the client task because `http_client.rs` is 28 of the
warnings and that task reshapes the config surface it would document.
## Acceptance Criteria
- [ ] `cargo doc` with `-W missing_docs` (as deny) exits clean — 0 warnings
- [ ] Enforcement landed (CI rustdocflags or lint config) so it stays clean
- [ ] HY-11 decision recorded; `cargo publish --dry-run --allow-dirty` package contents match the decision
- [ ] HY-04 resolved (documented or restructured)
- [ ] `cargo test`, `cargo clippy --all-targets -- -D warnings`, `cargo fmt --check` pass
## References
- docs/reviews/001-initial-implementation-review.md (Part H, HY-02, HY-04, HY-11)
## Notes
> Agent fills during implementation. The `cargo tree -d` and HY-10
> link items: HY-10's ADR-051 placeholder link in
> `src/adapters/from_openapi.rs:12` still resolves to a
> `https://docs.rs/alkhttp` placeholder — fix remaining placeholder/
> relative links opportunistically in this sweep and mark HY-10 fully
> resolved.
## Summary
> Filled on completion.