release(v0.3.1): patch release — post-Phase-3 cleanup batch #1 (D56) (#35)

Patch release closing two XS v1.x-roadmap deferrals that became actionable
once Phase 3 management endpoints existed:
- v1.x #4 — /health activeSpawns integration (ADR 0002 Amendment 6 forward note)
- v1.x #7 — AUTH_MISSING tuple test (D45 P3 deferral)

No feature surface change; D56 already merged at 5ebe3dc. This release commit
only bumps package.json 0.3.0 → 0.3.1 and promotes CHANGELOG.md Unreleased's
D56 entry to "## v0.3.1 — 2026-05-25".

Patch-release classification per release_kit.phase_rolling_mode cross-Phase
discipline: D56 landed on main after v0.3.0 was tagged, so this is a hotfix-
class patch. Bump patch, tag, release before next push. Tag push triggers
release.yml.

Test count: 601 (v0.3.0) → 603 (v0.3.1). 603/603 pass locally on release-v0.3.1
branch head.

Co-authored-by: dtzp555 <dtzp555@gmail.com>
Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "olp",
-  "version": "0.3.0",
+  "version": "0.3.1",
   "description": "Personal multi-provider LLM proxy. Successor to OCP. One HTTP endpoint, multiple subscriptions behind it, automatic routing + fallback + caching.",
   "type": "module",
   "main": "server.mjs",