Align safe-string codec with CSM keyword-based %HH escaping and CSM-Wiki VI documented APIs

[Copilot]

This PR aligns the safe-string codec behavior with CSM keyword-based escaping and the CSM-Wiki Arguments VI documented APIs.

What changed

• Implemented CSM-aligned public APIs in safe_string_codec/safe_string_codec.py:
  • make_string_arguments_safe(argument_string: str, ignore_argument_type: bool = False) -> str
  • revert_arguments_safe_string(safe_argument_string: str, force_convert: bool = False) -> str
• Adopted conservative character-based %HH escaping (uppercase hex) for CSM keyword-related characters:
  • -|@&<>\r\n/;,
  • % is also escaped as %25 to keep decoding unambiguous.
• Enforced strict %HH decoding with malformed-sequence validation.
• Kept package exports aligned with documented APIs only in safe_string_codec/__init__.py:
  • make_string_arguments_safe
  • revert_arguments_safe_string

Tests

Updated safe_string_codec/test_safe_string_codec.py to cover:

• Empty input
• Keyword characters and combinations (->, //, >>, >>>, ;, ,)
• % escaping behavior
• Control characters (\r, \n, plus \t, \x00)
• Unicode content (Chinese/emoji)
• Long mixed-input roundtrip
• ASCII roundtrip
• Malformed decode inputs and type validation
• <SAFESTR> prefix behavior with ignore_argument_type / force_convert
• Package-level public API import coverage

Documentation

Updated safe_string_codec/design_and_prompt.md with:

• Algorithm rationale and keyword-source alignment
• Encoding/decoding rules and ambiguity analysis
• Corner-case coverage details
• Mermaid flowcharts for both functions:
  • make_string_arguments_safe
  • revert_arguments_safe_string

[nevstop]

@copilot 我忘记告诉你哪些是关键字了，可以参考 https://nevstop-lab.github.io/CSM-Wiki/docs/reference/api-03-arguments.html#csm---revert-arguments-safe-stringvi

[Copilot]

Pull request overview

Adds a new safe_string_codec package that provides reversible HEX-escape encoding/decoding for arbitrary Python str values (including surrogate edge-cases), along with unit tests and a design note.

Changes:

• Implemented to_safe_string() / from_safe_string() using ~HH byte escapes over UTF-8 (surrogatepass).
• Added unittest coverage for roundtrip and malformed-input handling.
• Added package exports and a design/edge-case rationale document.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
safe_string_codec/safe_string_codec.py	Core encoding/decoding implementation and format documentation.
safe_string_codec/test_safe_string_codec.py	Unit tests for roundtrip behavior and error handling.
safe_string_codec/init.py	Exposes the codec functions at the package level.
safe_string_codec/design_and_prompt.md	Design notes and enumerated corner cases.

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[Copilot]

@copilot 我忘记告诉你哪些是关键字了，可以参考 https://nevstop-lab.github.io/CSM-Wiki/docs/reference/api-03-arguments.html#csm---revert-arguments-safe-stringvi

已按你给的 CSM 文档规则更新：改为基于关键字字符集合（-|@&<>\r\n/;,）做 %HH 转义，并补充了对应测试与文档说明（含 ->、//、>>>、;、, 以及 % 的处理）。对应提交：d324143。

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[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

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[nevstop]

@copilot 使用 https://github.com/NEVSTOP-LAB/CSM-Wiki/blob/main/.ref/VI%20Description/VI%20Description(zh-cn)/VI%20Description(zh-cn)%20-%2003.%20Arguments.md 中的名称和注释，参数保持一致

[Copilot]

@copilot 使用 https://github.com/NEVSTOP-LAB/CSM-Wiki/blob/main/.ref/VI%20Description/VI%20Description(zh-cn)/VI%20Description(zh-cn)%20-%2003.%20Arguments.md 中的名称和注释，参数保持一...

已按你给的 CSM-Wiki 文档对齐名称、注释和参数语义：新增 make_string_arguments_safe(argument_string, ignore_argument_type=False) 与 revert_arguments_safe_string(safe_argument_string, force_convert=False)，并保持旧接口兼容；测试与说明文档也同步更新。提交：38c606e。无 UI 变更，截图不适用。

[nevstop]

不要重构和嵌套函数，只要保留文档中的函数即可

[Copilot]

不要重构和嵌套函数，只要保留文档中的函数即可

已按要求只保留文档中的函数：移除了 to_safe_string/from_safe_string 两个包装接口，仅保留 make_string_arguments_safe 和 revert_arguments_safe_string，并同步更新导出与测试。提交：585d73b。本次无 UI 变更，截图不适用。

[nevstop]

@copilot 文档中添加两个函数的流程图

[Copilot]

@copilot 文档中添加两个函数的流程图

已在文档中补充两个函数的流程图（Mermaid）：make_string_arguments_safe 和 revert_arguments_safe_string，并做了术语一致性微调。提交：3907f2c。本次无 UI 变更，截图不适用。

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

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[Copilot]

PR description says the diff should be documentation-only/minimal doc update, but this change introduces new runtime code and a full unittest suite (codec implementation + exports). Please update the PR description/scope (or split into separate PRs) so reviewers and release notes match what’s actually being merged.

[nevstop]

@copilot apply changes based on this feedback

[Copilot]

已按该反馈调整 PR 描述范围，现已与实际合并内容一致（实现 + 测试 + 文档，而不仅是最小文档更新）。本次仅更新 PR 描述，无新增代码改动。当前分支提交：3907f2c。无 UI 变更，截图不适用。