Align Codex agent parity slices

[exe-dev-github-integration]

Summary

• Preserve typed v1 skill/mention items while suppressing ordinary skill/mention prompt text and persisting materialized skill context for stable replay.
• Reuse core child-run lifecycle notifications for CLI-created agents so parent turns receive Codex-shaped subagent completion mail.
• Align CLI agent commands for task-name path derivation, path-aware messaging, wait events, list output, and safe close semantics.

Verification

• cargo fmt --check
• git diff --check
• uv run --with pytest python -m pytest -q
• cargo test

No TUI rendering or terminal input code changed, so scripts/verify-terminal-ui.sh was not required for this batch.

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Summary by cubic

Aligns the terminal/browser agent with Codex across planning modes, tool use, subagent lifecycle, CLI, model selection, and execution. Adds plan-first collaboration, catalog-driven model defaults, safer file ops, richer telemetry, and thread-level config parity.

• New Features

  • Collaboration and TUI: /mode and /plan, chat-first Plan mode with proposed plan rendering, request_user_input prompts, instruction source and startup warning banners, palette updates, and smoke tests.
  • Execution and tools: unified exec lifetime via tree-sitter-bash, drain/cleanup and approval/sandbox parity, write guards outside the project and for .git/.agents/.codex, improved exit/stream/backoff, and expanded ToolSpec (namespace, namespace_description, output_schema, freeform).
  • Multi‑agent and CLI: agent tree collection and targeting, canonical path refs, consistent wait/final statuses and safe close, parent-aware subagent completion, preserved v1 typed inputs (skill/mention), and persisted materialized skill context.
  • Models and config: bundled codex-models.json and fallback prompt, catalog lookup with grouped recommendations, automatic provider/model defaults, and per‑run config profiles/overrides at the thread level.
  • Telemetry: added server/model/rate‑limit/verifications/reasoning-included events and usage attribution.

• Dependencies

  • Added/used: bm25, toml, iana-time-zone, tree-sitter, tree-sitter-bash, bytes, tokio, rand (plus core-foundation on macOS).

^{Written for commit 3e8a965. Summary will update on new commits. Review in cubic}