[codex] Minimal IPython edit prompt guidance

[samsja]

Summary

Minimal alternative to the larger IPython prompt PR.

Changes:

• adds one short reminder that %%bash must be the first line of an IPython code cell
• adds a compact edit-skill hint only when edit is installed
• keeps a single safe await edit(...) example using triple-single-quoted variables for texts that may contain triple double quotes
• adds focused prompt tests

No runtime guard and no IPython tool schema changes.

Validation

• uv run --frozen ruff check --isolated . => passed
• uv run --frozen ruff format --check --isolated . => 31 files already formatted
• uv run --frozen pytest tests/test_prompt.py tests/test_git_block.py -q => 62 passed

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Note

Low Risk
Changes are limited to system prompt text and unit tests; no runtime, tool schema, or guard behavior.

Overview
Tightens IPython system-prompt guidance and adds a conditional edit skill hint.

The IPython section now states that %%bash must be the first line of a code cell (no leading comments, blanks, imports, or Python). When edit is among installed skills, the prompt adds a short block recommending await edit(path=..., old_str=..., new_str=...) with triple-single-quoted old/new and exact string matching.

Tests cover the new %%bash wording and assert EDIT_SKILL_PROMPT appears only when edit is installed.

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