* refactor(hub): tighten Result<T> to typed-payload-per-kind discriminated union (#176)
Each Hub error variant now carries only its own typed payload. The generic
`errorKind` field is renamed to `kind`; `message`/`details` escape hatches
are removed from Hub-emitted errors. Factory functions (makeUnknownCommand,
makeInvalidArgs, makeHandlerRefusal, makeHandlerFailure) are exported and
used in phase-command-router.cjs. Callers switch on `result.kind`.
Part of ADR-0174 P1.2.
<!-- docs-exempt: no docs/ changes; API is internal to Hub callers -->
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
* fix(hub): act on P1.2 review findings (#176)
Addresses 4 review findings on PR #221:
- Hub now runtime-validates ok:false variants against the typed shape
and coerces malformed returns to HandlerFailure with a contract-
violation message (codex finding #1, code-review finding #1)
- catch path now preserves the original throwable for non-Error
throws via an Error wrapper with .thrown attached (codex finding #2)
- All 4 factory returns are Object.freeze'd (review finding #9)
- makeHandlerFailure validates cause is Error; non-Error causes are
wrapped with .thrown attached (review finding #10)
Tests added for each finding (TDD red → green).
Refs #176. Part of #174.
* fix(docs-lint): add docs-exempt markers to both P1.2 changeset fragments
Both `176-typed-result-discriminated-union.md` and `176-hub-p1.2-review-findings.md`
carry `type: Changed` which triggers the docs-required lint. Neither fragment had
a `<!-- docs-exempt: <reason> -->` marker, causing `docs-lint` to fail with
`FAIL_DOCS_MISSING`. Added the per-fragment exemption marker to both (the repo has
no `no-docs` label). This is a purely internal SDK refactor (ADR-0174 P1.2) with
no public docs surface.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---------
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
d011a6fac2