SP220 Checkpoint D: leaf extensions and JSON definitions

[MrFr3di]

Promotes accepted Checkpoint D into release/2.2.0.

Accepted checkpoint head: 741892d
JSON implementation PR: #70 (exact head 1b5210a)

Evidence:

• PR SP220-08: integrate reusable JSON definitions #70 exact head: CI, Windows JSON/Hosting/Baseline/health, CodeQL, Dependency Review, SonarCloud all green.
• Merged checkpoint-D CI run 33407952886: Ubuntu wide/Hosting and Windows JSON/Hosting/Baseline/health all green.
• 35 current consumers, package graph/metadata/ownership/version/SourceLink, trim/NativeAOT, tests, audits, and docs links passed.

This PR contains the cumulative Checkpoint D promotion only; no additional implementation commit is introduced.

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[sonarqubecloud]

Quality Gate passed

Issues
26 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud