docs(security): roll the support window to 2.1.x and 2.0.x

[scttbnsn]

v2.1.0 shipped, so under the two-minor window in SECURITY.md the supported lines are 2.1.x and 2.0.x and 1.7.x drops off. The table follows the policy that's already written above it. The 1.6.x maintenance branch is retired too; its tip is kept as the archive/maintenance-1.6.x tag.

Changelog

🔒 Security

• Updated SECURITY.md to support 2.1.x and 2.0.x.
• Marked 1.7.x as unsupported.
• Retired the 1.6.x maintenance branch.
• Preserved the 1.6.x tip under archive/maintenance-1.6.x.

[scttbnsn]

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Reviewing files that changed from the base of the PR and between 123da9a and e463103.

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• SECURITY.md

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📝 Walkthrough

Walkthrough

The security support matrix now lists 2.1.x as the latest supported release line. It retains support for 2.0.x, marks 1.7.x as unsupported, and changes the oldest listed line from 1.6.x to 1.7.x. The fully unsupported cutoff changes from < 1.6 to < 1.7.

Merge Risk: ⚪ Minimal · up to bff9b

The security-support documentation now lists 2.1.x and 2.0.x as supported and retires older lines. No current merge-blocking risk remains.

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/security-support-window

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[biggest-littlest]

Support table follows the stated two-minor window now that 2.1.0 is out.

[ALARGECOMPANY]

Support table follows the stated two-minor window now that 2.1.0 is out.