Disallow recursive resolve map resolution on jsonschema.json

[jviotti]

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

[augmentcode]

🤖 Augment PR Summary

Summary: This PR changes jsonschema.json URI remapping so resolve entries are applied only once (non-transitively), preventing recursive/chain resolution.

Changes:

• Updated `CustomResolver` to remap an identifier to a single final `target` without recursively invoking the resolver again
• Adjusted debug logging to reflect the single-step remap behavior
• Updated documentation to clarify that `resolve` lookups are non-transitive
• Refreshed existing tests to use a single direct remap rather than chained remaps
• Added a new validation test ensuring chained remaps fail under the new non-transitive semantics

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