fix(copyright): reject schema field author candidates

[mstykow]

Summary

• reject author candidates that structurally match a SQL type-and-constraint field declaration
• preserve ordinary names that merely begin with a type-like word
• cover the Dancer2 schema false positive with refiner and end-to-end regression tests

Issues

• Covers: follow-up found during final validation of False-positives when comparing provenant with scancode-toolkit output #1391

Scope and exclusions

• Included: bounded author-candidate refinement for relational schema fragments
• Explicit exclusions: no broad SQL file suppression and no ScanCode-output imitation

How to verify

• Scan Dancer2 and confirm lib/Dancer2/Manual/Cookbook.pod no longer reports INTEGER REFERENCES (id) as an author while Dancer Core and Dancer Core Developers remain.

Intentional differences from Python

• Provenant retains the genuine Dancer Core Developers attribution that ScanCode misses.

🤖 Generated with Claude Code

[mstykow]

@greptileai review