chore: enable ruff rules disabled during template sync

[endavis]

Chore Type

Tooling improvements

Description

During the pyproject-template sync (#2, PR #5), several ruff rules were added to the ignore list to allow existing code to pass. These should be addressed to fully adopt the template's stricter linting standards.

Rules to enable

Rule	Description	Est. Errors	Priority
ANN	Type annotations (flake8-annotations)	~1349	High
N	Naming conventions (pep8-naming)	~20	Medium
E501	Line too long (>100 chars)	~162	Low
SIM108	Use ternary operator	~4	Low
B019	lru_cache on methods	~3	Low

Proposed Changes

1. Enable one rule at a time
2. Fix errors or add targeted per-file-ignores
3. Create separate PRs for each rule

Success Criteria

• ANN rule enabled (or per-file-ignores added)
• N rule enabled
• E501 rule enabled
• SIM108 rule enabled
• B019 addressed (fix or document why ignored)
• doit check passes with all rules enabled

Additional Context

• Original bastproxy ruff rules preserved in issue chore: synchronize with latest pyproject-template #2 comments
• Template sync PR: chore: sync tooling and doit commands with pyproject-template #5