Fix SyntaxWarning on package init

[ababak]

Resolves #67

• I have added automatic tests where applicable.
• The PR contains a description of what has been changed.
• The description contains manual test instructions.
• The PR contains updates to the release notes.
• I have verified that the documentation is still up to date.

Changes

Fixed SyntaxWarning on package init. Described here: #67
Python 3.13 is already used in Houdini 22.0 and Maya 2027 so these warnings are annoying.

Test

Summary by CodeRabbit

• Refactor
  • Improved handling of internal text and filesystem sanitization patterns without changing user-visible behavior.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 2f3bd884-8dd2-46a3-a617-7be6ec64ec4c

📥 Commits

Reviewing files that changed from the base of the PR and between 4ee2ffb and 1ef817a.

📒 Files selected for processing (2)

• source/ftrack_api/plugin.py
• source/ftrack_api/structure/standard.py

🔗 Linked repositories identified

CodeRabbit considers these linked repositories for cross-repo context during reviews:

• ftrackhq/ftrack (manual) → reviewed against branch main instead of the default branch

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📝 Walkthrough

Walkthrough

Two string literals were changed to raw-string syntax: the discover docstring and the filesystem sanitization regex. Their content and behavior remain otherwise unchanged.

Changes

Raw string syntax updates

Layer / File(s)	Summary
Raw string syntax changes source/ftrack_api/plugin.py, source/ftrack_api/structure/standard.py	The discover docstring delimiter and sanitise_for_filesystem regex argument now use raw-string literals without changing their content or substitution logic.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title matches the main goal: fixing a SyntaxWarning in package initialization-related code.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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