fix: ChunkyPNG median filter bug + remove SVN support

[pftg]

Summary

• ChunkyPNG bug: filter_image_with_median defined but raised NotImplementedError, making supports? return true incorrectly. Removed the method so supports? returns false naturally.
• SVN removal: Delete 25 lines of SVN support code (pristine file lookup, svn info parsing). No Ruby projects use SVN since ~2015.

Test plan

• Full suite with CI=true (204 runs, 0 failures)

🤖 Generated with Claude Code

Summary by Sourcery

Remove unused SVN support code and align the ChunkyPNG driver API by dropping an unimplemented median filter method.

Bug Fixes:

• Ensure ChunkyPNG median filter support is not falsely advertised by removing the unimplemented filter method.

Enhancements:

• Simplify VCS handling by assuming Git and deleting legacy SVN checkout logic.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Removes unused/incorrect features: drops SVN-based VCS support in favor of always using Git for screenshot diffs, and deletes an unimplemented median filter hook from the ChunkyPNG driver so capability detection reflects reality.

Sequence diagram for Git-only screenshot checkout flow

sequenceDiagram
  actor TestRunner
  participant ScreenshotDiff as ScreenshotDiff
  participant Vcs as Vcs
  participant Git as GitRepository

  TestRunner->>ScreenshotDiff: request_diff(old_screenshot, new_screenshot)
  ScreenshotDiff->>Vcs: checkout_vcs(project_root, screenshot_path, checkout_path)
  Vcs->>Git: restore_git_revision(screenshot_path, checkout_path, root)
  Git-->>Vcs: previous_version_copied
  Vcs-->>ScreenshotDiff: checkout_completed
  ScreenshotDiff-->>TestRunner: diff_result

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Updated class diagram for Vcs and ChunkyPngDriver

classDiagram
  class Capybara_Screenshot_Diff_Vcs {
    <<module>>
    +String SILENCE_ERRORS
    +checkout_vcs(root, screenshot_path, checkout_path)
    +restore_git_revision(screenshot_path, checkout_path, root)
  }

  class Capybara_Screenshot_Diff_Drivers_ChunkyPngDriver {
    <<class>>
    +load_images(old_file_name, new_file_name)
    +add_black_box(image, region)
  }

  Capybara_Screenshot_Diff_Vcs <.. Capybara_Screenshot_Diff_Drivers_ChunkyPngDriver : used_by

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File-Level Changes

Change	Details	Files
Always use Git for VCS checkout and remove dead SVN support code.	Simplified VCS checkout to unconditionally call the Git restore helper rather than branching on repository type. Removed SVN detection based on presence of a .svn directory. Deleted the SVN restore implementation that tried to locate pristine files via .svn/text-base, svn info, and .svn/pristine paths.	lib/capybara/screenshot/diff/vcs.rb
Remove unimplemented median filter hook from ChunkyPNG driver to fix incorrect capability reporting.	Deleted the filter_image_with_median method that only raised NotImplementedError, so median filter support is no longer advertised. Left other driver behaviors (image loading, add_black_box, etc.) unchanged.	lib/capybara/screenshot/diff/drivers/chunky_png_driver.rb

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: b1657165-be0d-4786-983a-4e4001d966dd

📥 Commits

Reviewing files that changed from the base of the PR and between b97f576 and bed7cd8.

📒 Files selected for processing (5)

• lib/capybara/screenshot/diff/drivers/chunky_png_driver.rb
• lib/capybara/screenshot/diff/vcs.rb
• test/system_test_case.rb
• test/unit/drivers/chunky_png_driver_test.rb
• test/unit/vcs_test.rb

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/chunky-png-bug-and-ci-docs

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