Examples: consolidate example dirs, dedup TS profile tests, move ccda to on-the-fly

[ryukzak]

Consolidate and reorganize the examples/ directory: fewer top-level dirs, less duplication, clearer per-language structure, and a clean split between examples that commit their generated types and those generated on the fly.

Directory changes

Before → after:

examples/                              examples/
├── typescript-r4/             ──┐     ├── typescript-r4-us-core/        (merged)
├── typescript-us-core/        ──┘     ├── typescript-custom-packages/   (merged)
├── typescript-sql-on-fhir/    ──┐     └── on-the-fly/
├── local-package-folder/      ──┘         ├── norge-r4/
├── typescript-ccda/           ────────────┤   kbv-r4/
└── on-the-fly/{norge-r4,kbv-r4}/          └── ccda/                     (moved)

• typescript-r4 + typescript-us-core → typescript-r4-us-core — a single generate.ts pulls US Core 8.0.1 (which depends on R4 core), so one fhir-types/ tree holds both hl7-fhir-r4-core and hl7-fhir-us-core.
• local-package-folder + typescript-sql-on-fhir → typescript-custom-packages — both demonstrate non-registry input sources; a single generate.ts runs both in sequence: local StructureDefinitions via .localStructureDefinitions() → fhir-types, and a remote TGZ via .fromPackageRef() → sql-on-fhir-types.
• typescript-ccda → on-the-fly/ccda — ccda never commits its fhir-types/ (generated on the fly), so it belongs with the other on-the-fly examples. The parent on-the-fly/.gitignore already covers fhir-types/, and the depth-sensitive tsconfig/generate.ts paths were fixed.

Test dedup & naming

• Trimmed the US Core bp/bodyweight tests: the base profile-class API (create/apply/from/slice accessors, category auto-population) is already demonstrated against the R4 profiles, so the US Core files keep one self-contained create demo plus only US-Core-specific scenarios (constrained value[x] validation, narrowed-choice mutual exclusion, a working from() round-trip the R4 BP can't do, and Bundle<T> + multi-profile is()).
• Renamed the typescript-r4-us-core test files into a consistent scheme:
  • core-type usage: resources.test.ts, raw-extensions.test.ts
  • profile classes: profile-r4-{extension,bodyweight,bp}.test.ts, profile-us-core-{patient,bp,bodyweight}.test.ts

Build & CI

Makefile targets before → after:

test-typescript-r4-example          ─┐
test-typescript-us-core-example     ─┴→ test-typescript-r4-us-core-example
test-typescript-sql-on-fhir-example ─┐
test-local-package-folder-example   ─┴→ test-typescript-custom-packages-example
test-typescript-ccda-example         → test-on-the-fly-ccda   (under test-on-the-fly-example)

• CI (sdk-tests.yml): consolidated the two TypeScript SDK jobs into one test-typescript-r4-us-core-example job, renamed the local-package job to test-typescript-custom-packages-example, and removed the standalone ccda job (now covered by the on-the-fly job). Each on-the-fly example runs generate → typecheck → test.
• The test-on-the-fly-ccda target drops a redundant unit-test invocation (test/unit/typeschema/transformer/ccda.test.ts is already covered by make test).

Docs

• examples/README.md restructured into per-language sections (TypeScript / Python / C#), plus Template-Based and On-the-Fly; the C# Aidbox integration-test instructions moved into the C# section and a couple of stray snippets removed.
• Updated README.md, design docs, CLAUDE.md, and .zed/tasks.json references.

Notes

• The combined typescript-r4-us-core/fhir-types is committed and CI verifies it matches a fresh generation; the trimmed/merged outputs were regenerated and confirmed deterministic.
• The dated docs/posts/* blog archives still reference the old paths and were intentionally left untouched (they already point at since-removed files).