fix(process): stop heartbeat-only stalls in csa run

[RyderFreeman4Logos]

Summary

• stop idle watchdog from extending indefinitely on heartbeat-only/live-PID signals
• treat only concrete output growth as progress for idle extension
• add regression coverage for live PID + no progress timeout behavior
• sync lock/version metadata for this branch (weave.lock, workspace bump to 0.1.64)

Details

• split liveness probing into coarse signals vs progress signals in csa-process
• remove noisy progress sources (latest run log and first-probe non-empty baseline)
• keep coarse liveness for status/error classification without letting it bypass idle termination

Validation

• just fmt
• just clippy
• cargo test -p csa-process
• csa review --diff --tool codex (multiple rounds)
• csa review --range main...HEAD --tool codex

Notes

• just test hit an existing flaky performance gate in mcp_hub_e2e (latency threshold), unrelated to touched modules.

Fixes #305