Handle configuration base paths correctly on multi-file setups

[jviotti]

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

[cubic-dev-ai]

No issues found across 11 files

[augmentcode]

🤖 Augment PR Summary

Summary: Improves configuration parsing so relative paths resolve correctly when a configuration is composed from multiple files via extends/include.

Changes:

• Adds a new metadata field x-sourcemeta-one:path to collection entries and updates the JSON schema accordingly.
• During Configuration::read, stamps each collection entry with the originating configuration file path.
• During Configuration::parse, derives the per-entry base directory from that stamped path (and strips the metadata before passing to Blaze parsing).
• Updates CLI golden outputs and configuration read unit tests to expect the new metadata field.
• Adds a new unit test covering multi-file base-path behavior (relative lint rules and collection paths from an extended file).

Technical Notes: This keeps path resolution deterministic across mixed single-file/multi-file setups without changing existing entry formats beyond the additional x- metadata.

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[augmentcode]

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