Add the #3282 CHANGELOG entry

[erikdarlingdata]

Adds the [Unreleased] / ### Fixed entry for #3282, whose fix merged as #3328 (98c551af, storage V118). Lane PRs do not edit CHANGELOG.md, so the entry is spliced separately.

Two inserted lines: the entry at the top of ### Fixed and the [#3282] link definition. Anchored on the first ### Fixed at or after the [Unreleased] marker and asserted to land before ## [3.7.0], since the block opens with ### Added. CRLF preserved, zero bare LF.

[claude]

Reviewed. This is a CHANGELOG-only PR (one file, two inserted lines: the ### Fixed entry and its [#3282] link definition), so most of the usual review dimensions (T-SQL style, Lite/Darling code parity, SQL injection/security, performance) don't apply — there's no code here.

Checked the entry's claims against the actual #3328 implementation and they hold up:

• AlertPersistenceGate (PerformanceMonitor.Alerting/AlertPersistenceGate.cs) is the shared, host-agnostic primitive both evaluators use.
• Lite's SQL Server path (AlertEngine.cs) and Darling's PostgreSQL path (DarlingWorker.cs, PostgresAlertEvaluator) both call AlertPersistenceGate.Evaluate with 3 breach / 2 clear samples, confirming "both engines"/"both SKUs" in the text.
• Streak counting is per collected sample (not per sweep), and state is persisted per server, matching the "a re-read of one reading cannot fill the streak" and restart-safety claims.
• The missing-reading freeze behavior (no observation ≠ a clearing observation) matches the code comments in AlertEngine.cs around the CPU resolve arm.

Formatting/placement:

• New bullet is the first item under the existing ## [Unreleased] → ### Fixed heading, consistent with how other entries in this release were stacked (newest on top).
• [#3282] link definition added at the end of the reference-link block, no duplicate definition, and the file's CRLF line endings are preserved (confirmed via file — no mixed line-ending warning).
• Bullet style (bold summary, ([#issue]), - prose) matches the surrounding entries.

No issues found. LGTM.