Add a new x-format-assertion hint to force-enable format validation

[jviotti]

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

[augmentcode]

🤖 Augment PR Summary

Summary: This PR introduces a schema-level opt-in to treat format as an assertion (instead of the default annotation behavior) at specific subschema locations.

Changes:

• Bumps the vendored blaze dependency to a newer commit.
• Adds support in the Blaze compiler for a custom sibling keyword x-format-assertion: true to force-enable format validation.
• Uses the new flag to activate assertion-mode format compilation even when the global format_assertion tweak is not enabled.
• Extends documentation to explain default format behavior and how to opt into assertion behavior per-location.
• Adds CLI integration tests covering both Draft 4 and Draft 2020-12 for test and validate commands.

Technical Notes: The new behavior is activated via a boolean-only x-format-assertion sibling and is intended to work across dialects, including older drafts where format is otherwise only an annotation.

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[augmentcode]

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[cubic-dev-ai]

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