Enable RUF010 and RUF015 ruff rules

[helylle]

Enable RUF010 and RUF015 ruff rules

Enable two previously-ignored ruff rules and fix all violations across the codebase.

Changes

RUF010 — Use conversion flag in f-strings

Instead of calling str(), repr(), or ascii() inside f-strings, use the !s, !r, or !a conversion flags.

Before: f"value: {str(x)}"
After: f"value: {x!s}"

RUF015 — Prefer next(iter(...)) over single-element slice

Instead of creating an intermediate list just to get the first element (list(x)[0]), use next(iter(x)) which is O(1) and avoids allocating a list.

Before: list(items)[0]
After: next(iter(items))

Scope

• 73 files changed across the codebase
• Removed RUF010 and RUF015 from the ignore list in ruff.toml
• All fixes are mechanical/automated with manual review

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud