[ArthPatel1502]

Closes #4190. Implements an automated search-and-replace migration pattern across the codebase to cleanly substitute legacy multi-line GPL-2.0-or-later statements with inline 'SPDX-License-Identifier: GPL-2.0-or-later' declarations in-place.

Following the advice from @nilason and @echoix:

• Changes are executed in-place within the original license commentary positioning blocks.
• Complex multi-licensed or non-standard project files have been systematically skipped for manual isolation during phase two.
• Commits are structurally segmented by root architectural components (/lib, /db, core modules) to maximize review efficiency.
• Formatting layout conforms completely with pre-commit line hook expectations.

[github-actions]

Remaining comments which cannot be posted as a review comment to avoid GitHub Rate Limit

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* \author Original author CERL, probably Dave Gerdes or Mike

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[echoix]

What's the difference between #7557 and #7556?

[echoix]

Can you please run prek or pre commit locally before we take the time to look at 469 files changed in a same PR? Plus look at my review comment inline, wanting to understand why lines under the license text have their indentation changed

[wenzeslaus]

Replaced by #7743, #7749, and others. This required a deeper and broader change.