Speed up editor schema generation

[jviotti]

Signed-off-by: Juan Cruz Viotti [email protected]

[augmentcode]

🤖 Augment PR Summary

Summary: This PR updates the vendored Core/JSONSchema dependencies and speeds up editor-oriented schema generation.

Changes:

• Optimize sourcemeta::core::for_editor by assuming bundled input and indexing frame pointers to avoid repeated frame.uri() scans.
• Bump vendored JSONSchema to 14.0.4 and add simple HTTP resolution retries.
• Refine JSONSchema CMake for MSVC builds, more reliable git SHA detection, and a musl-based platform suffix on Linux.

Technical Notes: for_editor now expects the input schema to be pre-bundled (documented in the header).

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[augmentcode]

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