[CG-15] Demo Code Cities: one small + one large per language

[jgrodziski]

Priority: P1
Owner: David (stress-test Fineract, then PetClinic)

Language	Small	Large
Java	Gson (current example) · Spring PetClinic	Apache Fineract or Broadleaf
TypeScript	—	VS Code
C#	—	nopCommerce

Revisit the list of cities already named in the docs and align it with this table.

Acceptance criteria

• Each listed repo extracted end to end (with history once CG-01 ([CG-01] Capture Git history at extraction time (not as a post-processing step) #1) to CG-04 ([CG-04] Decide the history replay step (per commit vs. sampling) #4) land)
• Cities published (CG-16 ([CG-16] Publish Code Cities online (static, on-demand loading) #16))

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Source: CodeGraph backlog extracted from the 2026-09-21 weekly (David / Jérémie).