chore(release): prepare agent-runtime 0.15.1

[drewstone]

Summary

• bump @tangle-network/agent-runtime to 0.15.1 for the merged supervisor release
• update @tangle-network/agent-eval to ^0.33.1 because current main imports exports added after 0.30.0
• remove a stale unused import surfaced by release lint

Verification

• pnpm typecheck
• pnpm build
• pnpm lint
• pnpm test
• pnpm test:workers

Release note

Publishing still requires merging this PR, then pushing tag v0.15.1. The publish workflow is tag-triggered and enforces package.json version == tag.

[tangletools]

Verified. Two missing production-pattern examples: chat-handler (DurableChatTurnEngine.runTurn end-to-end with fresh + replay paths) and production-trace-sink (per-session TraceEmitter + canonical RunRecord persistence). Both offline. typecheck 0, Node suite 251, workerd suite 2, biome clean, build green.