Stream and resume scoped native CLI sessions

[engkimo]

What changed

• complete the Chat CLI hook/tool execution and permission-mode groundwork
• add single-engine --route-direct paths for Codex CLI and Claude Code
• preserve native workspace, permission, project settings, skills, hooks, MCP, and plugins
• normalize Codex JSONL and Claude stream-json into provider-independent events
• persist and render native events incrementally while either engine is running
• resume explicit native sessions with workspace and permission provenance checks
• clean up cancelled child processes without swallowing caller cancellation
• record the multi-engine control-plane strategy and update Chat CLI specs/handoff docs

Why

Morphic should preserve strong native agent loops while owning cross-engine routing, safety, audit, session continuity, cost/result normalization, and handoff. The previous Chat CLI defaulted to deterministic local output or a multi-role council, and its CLI adapters discarded native event activity and safety scope.

Impact

morphic chat and morphic code can opt into a scoped Codex or Claude runtime, expose concise live progress, retain raw provider events in the append-only ledger, and continue the exact native session on later turns. Resume fails closed if workspace or permission provenance differs.

Validation

• uv run --extra dev pytest tests/unit/ -q — 3,519 passed
• uv run --extra dev ruff check . — clean
• git diff --check — clean
• no paid/live Codex or Claude task was invoked; subprocess streaming and command shape are covered locally

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch agent/codex-direct-stream-resume

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