feat: pass prompt to continue prompt hook

[frostming]

Summary

• add prompt as the first argument of continue_prompt, following the hook introduced in feat: add continue prompt hook #281
• pass the prompt used by the completed agent-loop step while preserving the full str or list-of-content-parts shape
• update builtin behavior, async hook coverage, agent-loop integration tests, and English and Chinese hook references

Verification

• uv run ruff check .
• uv run ruff format --check .
• uv run mypy src
• uv run pytest -q (278 passed)
• commit hooks passed

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	bub	fa08090	Commit Preview URL Branch Preview URL	Aug 14 2026, 08:28 AM