SC-45749 Migrate to dateless license headers

[claire-villard-sonarsource]

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[hashicorp-vault-sonar-prod]

SC-45749

[sonar-review-alpha]

Summary

This PR removes date ranges from all copyright headers across the project and standardizes them to a dateless format. Specifically:

• Copyright headers like "Copyright (C) 2011-2025 SonarSource Sàrl" become "Copyright (C) SonarSource Sàrl"
• README.md and NOTICE.txt are updated to match the new standardized format
• The change is purely mechanical—all 125 files are updated by removing the year range, affecting no code logic or functionality

This aligns copyright headers with modern best practices where copyright dates are not maintained inline.

What reviewers should know

Scope: 125 files changed, all with identical 2-line modifications (removing date ranges).

Files to spot-check:

• NOTICE.txt and README.md for the header format change
• One file from each module (batch-interface, cache, main lib, tests, integration tests) to verify consistency

Pattern: All changes follow the same pattern—the only variation is between different header styles (Java block comments, Maven pom.xml, etc.), but the date removal is consistent everywhere.

No functional impact: This is purely a header metadata update. No imports, logic, dependencies, or test behavior are affected. The stat diff of "+1, -1" on every file confirms only header lines were touched.

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🗣️ Give feedback

[jerome-chetelat-sonarsource]

There's the license in README.md to change

[claire-villard-sonarsource]

There's the license in README.md to change

Good catch! Done

[sonar-review-alpha]

LGTM! ✅

Clean, purely mechanical change — no logic, no behavior, no risk. Every one of the 125 modified files has exactly one line changed: the copyright year range stripped out, leaving only the copyright holder name. The README.md change also standardizes the phrasing to match the rest of the codebase ("Copyright (C) SonarSource Sàrl" instead of the previous "Copyright 2011-2025 SonarSource.").

🗣️ Give feedback

[sonarqube-next]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
0 Dependency risks
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarQube

[jerome-chetelat-sonarsource]

LGTM