fix(jangar): relax torghut status timeout

[gregkonush]

Summary

• Replaces the hardcoded 2s Jangar Torghut status fetch timeout with a configurable JANGAR_TORGHUT_STATUS_TIMEOUT_MS setting.
• Defaults the timeout to 5000ms and bounds overrides at 30000ms so the empirical-services gate can tolerate the observed Knative status latency without hanging indefinitely.
• Adds regression coverage for a slow successful Torghut status response and for a configured timeout degradation.
• Documents the new rollout-safety setting in the Jangar README.

Related Issues

None

Testing

• PASS bun install --frozen-lockfile --ignore-scripts
• PASS bun run --cwd services/jangar pretest
• PASS bun run --cwd services/jangar test -- src/server/__tests__/control-plane-config.test.ts src/server/__tests__/control-plane-empirical-services.test.ts
• PASS bun run --cwd services/jangar tsc
• PASS bun run --cwd services/jangar lint
• PASS bun run --cwd services/jangar lint:oxlint with existing warnings only
• PASS bun run --cwd services/jangar lint:oxlint:type with existing warnings only
• PASS bunx oxfmt --check services/jangar/src/server/control-plane-config.ts services/jangar/src/server/control-plane-empirical-services.ts services/jangar/src/server/__tests__/control-plane-config.test.ts services/jangar/src/server/__tests__/control-plane-empirical-services.test.ts
• PASS git diff --check

Breaking Changes

None

Checklist

• Testing section documents the exact validation performed (or N/A with justification).
• Screenshots and Breaking Changes sections are handled appropriately (removed or filled in).
• Documentation, release notes, and follow-ups are updated or tracked.

[gregkonush]

Status: merged and rollout verified.

Evidence:

• PR fix(jangar): relax torghut status timeout #5564 merged as 6ae22d3f26ff284b91746f6276f9381780d823d9 after all required checks passed.
• Local validation passed: bun install --frozen-lockfile --ignore-scripts, bun run --cwd services/jangar pretest, targeted Bun tests, tsc, lint, lint:oxlint, lint:oxlint:type, bunx oxfmt --check, and git diff --check.
• GitHub checks were green or skipped: agents-ci / integration passed in 15m51s, agents-ci / validate passed, jangar-ci / lint-and-typecheck / run passed, title/commit/routing checks passed.
• The fix was built and promoted; it was later superseded by follow-up Jangar images, with current rollout verified at image 49e27b93.

Decision: complete. Current Jangar rollout is Synced/Healthy through promotion PR #5574 and post-deploy verification run 25405337063.