Support instancePosition in standard output

[staging-devin-ai-integration]

Add instancePosition support to standard output with pointer tracker

Summary

This PR extends sourcemeta::blaze::standard with a new overload that accepts a sourcemeta::core::PointerPositionTracker.

When the tracker is provided (Basic output mode), emitted error and annotation units are augmented with an instancePosition property containing line/column bounds as:

[ lineStart, columnStart, lineEnd, columnEnd ]

Implementation notes:

• Existing standard(...) behavior/signature is preserved and now delegates internally.
• instancePosition is only added when a tracker lookup exists for the unit's instanceLocation.
• Added tests covering both:
  • error output with instancePosition
  • annotation output with instancePosition

Review & Testing Checklist for Human

• Confirm the new overload signature/order (instance, tracker, format) matches the intended public API and downstream usage expectations.
• Validate the instancePosition values (especially line/column indexing semantics) against expected PointerPositionTracker conventions for a few sample payloads, including nested objects/arrays if relevant.
• Run/inspect a basic consumer flow that uses standard output and ensure the added field is only present when using the tracker overload, and existing output remains unchanged otherwise.

Recommended human test plan:

1. Parse an instance with PointerPositionTracker and call the new standard(...) overload in Basic mode.
2. Verify errors[*].instancePosition and annotations[*].instancePosition exist and map to the tracked pointer positions.
3. Call the original overload and confirm output schema is unchanged (no instancePosition fields).

Notes

• Local verification completed: make configure compile && make (passes).
• Link to Devin Session: https://staging.itsdev.in/sessions/017e508635f2472f997e25139ca89361
• Requested by: bot_apk

[staging-devin-ai-integration]

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