chore: switch to @tony.ganchev/eslint-plugin-header

[tonyganchev]

This fork of eslint-plugin-header supports ESLint 9 without any hacks necessary to bypass schema validation.

Furthermore it is continuously updated,, has many bug-fixes, particularly for Windows support, and comes with significant UX improvements such as more precise violation messages, line reports. etc.

Notes:

• The header configuration enforces 2025 as the two-year. I assume eventually the whole codebase will need to be updated for 2026. Instead, using regex matching, years can be configured to match a format - and still support autofix.
• based on the above, if a single-line regex is used, you don't need to disable linting of src/lib/bundles.ts

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 3c3c86bb-2709-43e3-bcd1-09bcdfc63ca0

📥 Commits

Reviewing files that changed from the base of the PR and between 611b5cf and 5ba92b6.

⛔ Files ignored due to path filters (1)

• yarn.lock is excluded by !**/yarn.lock, !**/*.lock

📒 Files selected for processing (2)

• eslint.config.mjs
• package.json

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📝 Walkthrough

Walkthrough

The pull request updates the ESLint header plugin dependency from the unscoped eslint-plugin-header package to the scoped variant @tony.ganchev/eslint-plugin-header (v3.3.0). The configuration is updated to use the new import, and a schema workaround is removed.

Changes

Cohort / File(s)	Summary
Header Plugin Dependency Update eslint.config.mjs, package.json	Replaced eslint-plugin-header dependency with scoped package @tony.ganchev/eslint-plugin-header (^3.3.0) in manifest and configuration. Removed schema workaround in ESLint config, suggesting the scoped package resolves the original issue.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: switching from eslint-plugin-header to @tony.ganchev/eslint-plugin-header, which is directly reflected in the file changes.
Description check	✅ Passed	The description is directly related to the changeset, explaining the rationale for switching to the fork, its benefits (ESLint 9 support, bug fixes), and implementation notes about header configuration.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

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📝 Coding Plan

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