chore: release 0.23.1 — backfill CHANGELOG, bump version

[klappy]

Release 0.23.1 — Telemetry Instrumentation Patch

Version bump and CHANGELOG entry for PR #131 (already merged to main). Mirrors the established release pattern (PR #128 for 0.22.0, PR #130 for 0.23.0): chore PR lands version + CHANGELOG on main, then a separate main → prod promotion PR ships it.

Scope

File	Change
package.json	0.23.0 → 0.23.1
workers/package.json	0.23.0 → 0.23.1
CHANGELOG.md	Backfill [0.23.1] section with Fixed, Changed, Refs

3 files, +20/-2 lines. No code changes — pure release metadata.

SemVer rationale: patch (0.23.0 → 0.23.1)

PR #131 is a telemetry instrumentation fix — no API surface change, no MCP request/response behavior change, no tool registration change, no breaking change. Telemetry value semantics shift (blob8 value changes from "unknown" to real semver), but the schema is unchanged. Patch is the correct bump.

Release-validation-gate disposition

Per klappy://canon/constraints/release-validation-gate:

• Rule 1 (no merge with active reviews): all checks completed on PR fix(telemetry): blob8 falls back to BUILD_VERSION; clarify duration_ms semantics #131 head fbe51e4616. Bugbot clean, zero findings.
• Rule 2 (independent fresh-context validation): satisfied on PR fix(telemetry): blob8 falls back to BUILD_VERSION; clarify duration_ms semantics #131 itself. Validator session sesn_011CaHXQGvRSKZvoRUNauwxv (Sonnet 4.6 via Managed Agents) ran the 5-corroboration gauntlet. See validator verdict and smoke round 2. Effective verdict: PASS, zero code defects.
• Rule 3 (canon wins): PR fix(telemetry): blob8 falls back to BUILD_VERSION; clarify duration_ms semantics #131's incorrect "validator not required" framing was retracted in its amended body. Canon won.

This chore PR is metadata-only (CHANGELOG + version) and does not touch load-bearing surface. It does not require its own validator dispatch — the underlying code change (PR #131) was already validated.

Carry-forward

O-open: amend klappy://canon/constraints/release-validation-gate "What Counts As Load-Bearing Surface" section to explicitly categorize telemetry instrumentation changes. Resolves the ambiguity surfaced during PR #131's review.

---

Note

Low Risk
Low risk: this PR only updates release metadata (version numbers and CHANGELOG.md) and does not change runtime code paths.

Overview
Cuts the 0.23.1 release by bumping the root and worker package versions from 0.23.0 to 0.23.1.

Backfills CHANGELOG.md with a new 0.23.1 entry documenting the already-landed telemetry instrumentation fix (worker worker_version fallback) and expanded telemetry schema docstrings, plus references to PR #131 and validation context.

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