Improve indexing logs around absolute paths

[jviotti]

Signed-off-by: Juan Cruz Viotti jv@jviotti.com

[cubic-dev-ai]

No issues found across 4 files

[augmentcode]

🤖 Augment PR Summary

Summary: Improves indexing progress output by avoiding absolute filesystem paths in log messages.

Changes:

• Introduces display-only paths for schemas, explorer, and routes.bin using std::filesystem::relative against the output directory.
• Uses these display paths in print_progress and DISPATCH skip/progress logging while keeping the actual output targets unchanged.
• Updates CLI golden tests to expect the shorter, relative log paths.

Technical Notes: This should be a logging-only change; generation still uses the original absolute/fully-qualified paths for filesystem operations.

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[augmentcode]

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