docs: refresh SECURITY.md supported versions and mark telemetry design shipped

[warpedatom]

Doc-only refresh, no version bump or release.

• SECURITY.md: supported-versions table moved 2.x -> 3.x (tool is at 3.2.0); 2.x now EOL, <2.0 unsupported.
• docs/TELEMETRY-CORRELATION-DESIGN.md: status changed from 'Draft / Target Sept 2026' to 'Shipped in 3.2.0 (2026-07-21)', with a note that shipped behavior is authoritative.

No packaged/module files touched.

Summary by Sourcery

Update documentation to reflect 3.x as the supported security baseline and mark telemetry correlation design as shipped in 3.2.0.

Documentation:

• Refresh SECURITY.md supported-versions table to show 3.x as supported, 2.x as end-of-life, and pre-2.0 as unsupported.
• Clarify that security fixes are released against the latest 3.x version.
• Update telemetry correlation design document to mark the feature as shipped in 3.2.0 and note that implementation behavior is authoritative over the original design.

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