chore(release): 0.46.0 — eval substrate unification + sandbox live-path fix

[drewstone]

Releases the six commits on main since 0.45.0:

• eval substrate (search-bench + generate-eval) + unified executor/driver surfaces (feat: eval substrate (search-bench + generate-eval) + unify the executor/driver surfaces #190)
• sandbox live-path: require sandbox 0.4.3 (SSE reconnect), poll follows the assigned session id, infra errors surfaced (fix(loops): sandbox live-path — sandbox 0.4.3 (SSE reconnect) + poll session-id + fail-loud infra errors #189)
• runtime decision-point persistence (feat(bench): persist runtime decision points #191), router-backed loop executor (feat(bench): router-backed loop executor — stateful research through the real kernel #188), research-leaderboard worker (feat(bench): research-leaderboard worker (router-RAG) + sandboxAgentRun env passthrough #186), deep-clean recovery (chore(deep-clean): recover orphaned hardenings + dedup bench gates + de-dup steer-firewall #187)

Build + 676 tests verified green on the release SHA.