WKS-2691 - jf worker init fetches tsconfig.json from the platform with embedded fallback

[ehl-jf]

Summary

• Add FetchTsConfig helper (GET worker/api/v1/scaffold/tsconfig)
• jf worker init now fetches tsconfig.json from the server, falls back to an embedded strict-mode default on any fetch problem, and skips generation if tsconfig.json already exists (still overwritable with --force)
• Update AI-agent help text to describe the new behavior

[github-actions]

Unit Tests Results

267 tests  +10   267 ✅ +10   1m 16s ⏱️ -6s
  3 suites ± 0     0 💤 ± 0 
  1 files   ± 0     0 ❌ ± 0 

Results for commit 623a3cd. ± Comparison against base commit 6053ab3.

This pull request removes 2 and adds 12 tests. Note that renamed tests count towards both.

commands ‑ TestInitWorker/dont_overwrite_tsconfig.json_without_force
commands ‑ TestInitWorker/overwrite_tsconfig.json_with_force

commands ‑ TestInitWorker/fetch_tsconfig.json_from_the_server
commands ‑ TestInitWorker/force-overwrite_tsconfig.json_with_server_content
commands ‑ TestInitWorker/regenerate_tsconfig.json_when_it_already_exists_and_force_is_set
commands ‑ TestInitWorker/skip_tsconfig.json_generation_when_it_already_exists_and_no_force
common ‑ TestFetchOptions/propagate_projectKey
common ‑ TestFetchOptions/success
common ‑ TestFetchTSConfig
common ‑ TestFetchTSConfig/endpoint_not_found
common ‑ TestFetchTSConfig/invalid_json_body
common ‑ TestFetchTSConfig/propagate_projectKey
…

♻️ This comment has been updated with latest results.

[RemiBou]

QA passed — ready for merge (WKS-2691)

Manual (VS Code / CLI against https://wks2691tenant1.jfrogdev.org):

• Generated tsconfig.json matches GET /worker/api/v1/scaffold/tsconfig
• IDE uses that config (strictNullChecks flags null misuse)
• Endpoint protection: no token 401, regular user 403, admin 200

Also covered: skip existing tsconfig, --force overwrite, embedded fallback, help text, regression (GENERIC_EVENT / --no-test / --project-key), local tsc emit, no secrets in the config.

Jira moved to Ready For Merge.

[github-actions]

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