fix: Starlark rules generated with multiline string cause parse error

[ningjiabing]

Bug Description

When clicking "Always Allow" in CodeIsland for a Codex command that contains multiline content (e.g. python3 -c with inline Python code), the generated Starlark rule file contains raw newline characters inside a string literal, causing a parse error.

Error

Error loading rules:
/Users/ningjiabing/.codex/rules/codeisland.rules:111: starlark error: error: Parse error: unfinished string literal (problem is on or around line 111)

Reproduction

1. Use Codex to run a multiline command like: python3 -c "import json\nd=json.load(...)"
2. Click "Always Allow" in CodeIsland for this command
3. CodeIsland writes the raw multiline string into ~/.codex/rules/codeisland.rules
4. Starlark parser fails with unfinished string literal

Generated (Broken) Output

prefix_rule(
    pattern = ["python3", "-c", "
import json
d=json.load(open('/tmp/apps.json'))
for a in d.get('apps',[]):
    ...
"],
    decision = "allow",
)

Expected Output

Newlines should be escaped as \n:

prefix_rule(
    pattern = ["python3", "-c", "import json\nd=json.load(open('/tmp/apps.json'))\nfor a in d.get('apps',[]):\n    ...\n"],
    decision = "allow",
)

Fix Suggestion

In the rule generation code, when serializing command arguments to Starlark string literals, escape \n → \\n and \r → \\r before writing to the .rules file.

Environment

• macOS arm64 (Apple Silicon, macOS 26)
• CodeIsland: installed via Homebrew
• Codex CLI

[hexsean]

碰见了一样的问题，改坏了无法启动codex

[wxtsky]

已修复 —— #252（感谢 @hexsean 的 PR）已合并进 main，将随下个版本发布。

在新版本发布之前，如果 codex 已经因为坏规则无法启动（@hexsean 提到的情况），可以手动处理一下：打开 ~/.codex/rules/codeisland.rules，删掉其中未闭合的 prefix_rule(...) 段落（或者直接删除整个文件），codex 即可恢复启动。升级到下个版本后新写入的规则会正确转义 \n / \r，不会再出现这个问题。