Fix feature detection for quoted filenames

[AnushLoknath]

Fixes #14

Filenames containing apostrophes could silently erase detected features because xargs interpreted quotes in file paths.

• Use find -print0 and xargs -0 in both scan modes.
• Preserve null-delimited grep output for accurate filename handling and counts.
• Add regression coverage for quoted paths, spaces, and other special filename characters.

Validation:

• Both scan-mode regression tests fail against the original code.
• Recon tests: 6 passed, 4 POSIX-only cases skipped on Windows.
• Local testing used Git for Windows utilities and a temporary runner workaround for an existing SIGKILL import incompatibility.
• git diff --check passed.

[greptile-apps]

Confidence Score: 5/5

[Medium risk] Fixes filename handling in feature detection logic.

The PR appears safe to merge; no actionable issue was established.

Summary

The PR makes feature detection preserve filenames literally through both scan modes and adds regression tests for quoted and other special-character paths.

• Changes file collection, grep input, grep output, and counting to use NUL delimiters.
• Exercises both the regex and large-repository fixed-string scan paths.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  A["find -print0"] --> B["NUL-delimited file list"]
  B --> C{"File count > 5000?"}
  C -->|Yes| D["xargs -0 → grep -FlZ"]
  C -->|No| E["xargs -0 → grep -ElZ"]
  D --> F["Split matches on NUL"]
  E --> F
  F --> G["Feature counts"]

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