Add autonomous quality gates

[sethkarten]

Summary

• add configurable autonomous quality gates with repeatable --autonomous-gate <command> flags
• run gates before satisfying the autonomous finish contract
• feed failed gate output back to the session up to a retry limit
• support gate retry and timeout configuration from CLI runtime config

Testing

• npm --prefix packages/coding-agent test -- suite/agent-session-autonomous.test.ts args.test.ts
• ./node_modules/.bin/tsgo --noEmit
• npm run check
• isolated daemon smoke with temp socket/session dirs: start/create/list/shutdown using --autonomous --autonomous-gate "printf ok"

Note

Add autonomous quality gates to coding agent CLI and runtime

• Adds --autonomous-gate, --autonomous-gate-retries, and --autonomous-gate-timeout-ms CLI flags to args.ts; providing any gate flag enables autonomous mode automatically.
• When the agent attempts to finish, autonomous.ts runs each configured gate command via spawnSync; on failure it feeds combined stdout/stderr back as a corrective user message and increments continuationsUsed.
• Per-command retry attempts are tracked in gateAttempts; once maxRetries is exceeded for a command, gate-driven continuations stop for that command (default 3 retries, 5-minute timeout).
• Gate output fed back to the assistant is truncated to 6000 characters to avoid oversized messages.
• Behavioral Change: nextAutonomousContinuation is now async and must be awaited; finish decisions may now be suppressed and replaced with corrective prompts when gates fail.

^{Macroscope summarized dbc2969.}

[sethkarten]

Closing as superseded by #222. Autonomous quality gates are now folded into the unified autonomous continuation PR.