Hotfix: Replace regex with function

[chrismaddalena]

This PR replaces the ANSI escape regex with a new function called _strip_ansi_escapes(). This change addresses a potential issue with that original expression's use of backtracking when parsing Asciinema recordings. While we did not encounter any issues with simulated terminal recordings, the backtracking could result in a ReDOS scenario. The function retains all the same escaping and behavior without the regex.

I am also using this to introduce the AGENTS.md files for onboarding AI agents to the repository and fixing the packages lock file.

[chatgpt-codex-connector]

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[Copilot]

Pull request overview

This PR mitigates a potential ReDoS risk in asciinema text extraction by replacing an ANSI escape stripping regex with a linear-scan function, and adds an agent/onboarding guideline document for the repository.

Changes:

• Replaced the ANSI escape sequence regex with _strip_ansi_escapes() and updated extract_cast_text() to use it.
• Added/expanded unit tests for OSC (BEL/ST), Fe escapes, and malformed OSC fragments.
• Added a repository-level AGENTS.md with project structure, commands, and style/testing guidelines.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
ghostwriter/oplog/utils.py	Introduces _strip_ansi_escapes() and uses it during asciicast event extraction.
ghostwriter/oplog/tests/test_utils.py	Adds test coverage for additional ANSI/OSC stripping scenarios and malformed inputs.
AGENTS.md	Adds onboarding guidance for AI agents (structure, commands, style, and PR expectations).

[codecov]

Codecov Report

❌ Patch coverage is 90.00000% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.21%. Comparing base (9e18d59) to head (57e35df).
⚠️ Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
ghostwriter/oplog/utils.py	83.63%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #866      +/-   ##
==========================================
- Coverage   92.22%   92.21%   -0.01%     
==========================================
  Files         384      384              
  Lines       23896    23983      +87     
==========================================
+ Hits        22038    22116      +78     
- Misses       1858     1867       +9     

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