chore: finalize 2026.4.5 release metadata

fix: defer native runtime loading during register

fix: improve cross-platform toolchain compatibility

refactor: replace bash debug scripts with node cli

refactor: switch voice runtime to node toolchain

fix: extract trailing assistant text blocks only

fix: treat approval prompts as progress text

fix: prefer latest assistant text in same turn

fix: wait for assistant reply to settle before voice fallback

fix: block tts tool in voice inbound sessions

fix: disable risky voice-reply fast paths by default

fix: disable before_agent_reply for voice inbound

fix: defer before_agent_reply in transcript sessions

fix: ignore transcript echoes in before_agent_reply

fix: prioritize final reply voice path