Reconcile jump palette ledger row with accepted wave 1 evidence

[coneilen]

Summary

This is a ledger reconciliation by the wave-2 coordinator. The jump palette row in investigation/ui-parity-matrix.md now cites the accepted wave-1 evidence:

• Windows parity: in-window dark jump palette matching macOS (#776) #788 (the contained dark palette, labels, two-line rows, type bars and state dots);
• Windows parity: jump palette dimming, anchoring, attention-first order and a scrollbar that stays dark on hover (#776) #792 (owner dimming, positioning, attention-first ranking, and a dark overflow scrollbar through hover, drag and track).

The row stays Partial:

• choosing a result selects the project canvas instead of opening the loop workspace (Windows parity: Jump palette selection should open the loop like a sidebar tap, not just select it on the canvas #799);
• hardware wheel routing, physical input, assistive-technology conformance and full rendered fidelity remain unverified.

Changes

• investigation/ui-parity-matrix.md: the jump palette row is rewritten. The status is unchanged (Partial), so the counts stay at 36 Validated, 60 Partial and 2 Out of scope.

Test plan

RED: Select-String origin/main investigation/ui-parity-matrix.md jump palette row for #788 -> 0 matches; the row still described the pre-#788 light popup
GREEN: git diff origin/main...a8715f9 -> one row rewritten, citing #788, #792, #776 and #799, status still Partial
REGRESSION: matrix status-count regex on the branch -> 36 Validated, 60 Partial, 2 Out of scope (unchanged); exact-head CI on this PR

This is a documentation-only change, so the Windows suites and macOS make test/make check were not run.

Checklist

• I have read the Contributing Guidelines
• I have signed off my commits (git commit -s) per the DCO
• Tests pass locally (make test)
• Code follows the existing style (make check)
• I added the test/contract before the implementation and observed the intended RED failure