Fix pre-commit findings: mypy no-any-return, pylint warnings, missing EOF newline

[spoorcc]

• Wrap Prompt.ask().strip() calls in str() to satisfy mypy's no-any-return
  check in dfetch/terminal/prompt.py and dfetch/commands/add.py.
• Rename unused context step argument to _context in
  features/steps/git_steps.py to fix pylint's unused-argument warning.
• Rename the module-level keystrokes variable in
  doc/generate-casts/interactive_helper.py to avoid pylint's
  redefined-outer-name warning against the same-named local variables.
• Add missing trailing newline to security/dfetch.component-definition.json.

Co-Authored-By: Claude Sonnet 5 noreply@anthropic.com
Claude-Session: https://claude.ai/code/session_017w9xdxabPZ98pNJfbm9Dmd

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📥 Commits

Reviewing files that changed from the base of the PR and between edc169d and 3fb3c6a.

📒 Files selected for processing (5)

• dfetch/commands/add.py
• dfetch/terminal/prompt.py
• doc/generate-casts/interactive_helper.py
• features/steps/git_steps.py
• security/dfetch.component-definition.json

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