[codex] Add daemon-backed CLI chat

[tobomobo]

Summary

• Add top-level kassiber chat as a daemon-backed terminal client for ai.chat, including one-shot prompt mode and an interactive REPL.
• Stream daemon chat deltas to the terminal, route mutating tool consent through ai.tool_call.consent, and send ai.chat.cancel for terminal cancel paths.
• Add scripted consent policy flags: broad --yes and narrower --allow-tool <daemon-tool-name>.
• Document the CLI/GUI parity contract in README, AI reference docs, AGENTS.md, and the Kassiber skill command templates.

Validation

• uv run python -m py_compile kassiber/cli/chat.py kassiber/cli/main.py tests/test_cli_chat.py
• uv run python -m unittest tests.test_cli_chat -v
• uv run python -m unittest tests.test_cli_smoke -v
• ./scripts/quality-gate.sh

Note: the first quality-gate attempt stopped because the fresh worktree was missing ui-tauri/node_modules; I installed the pinned pnpm dependencies with pnpm --dir ui-tauri install --frozen-lockfile and reran the gate successfully.