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* 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>
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