fix(server): bound final partition diagnostic

[imbajin]

After detecting assigned partitions, the Server entrypoint printed partition diagnostics with an unbounded HTTP request. A stalled response could keep the entrypoint waiting even after the JVM had exited.

Bound that final diagnostic with the existing WAIT_PARTITION_TIMEOUT_S setting. Partition polling and the final diagnostic each have their own timeout; signal forwarding and child-process cleanup are preserved. Observing a JVM exit may wait until the diagnostic completes or reaches its deadline.

Validation: a real stalled loopback HTTP response outlives the configured budget before the fix and times out afterward. The existing CI entrypoint suite verifies the JVM exit status, TERM/INT and process-group cleanup. Java 17 formatting, clean reactor compilation and three independent reviews passed. These checks cover shell/HTTP process behavior; real Docker/OOM and distributed acceptance remain open.

Related release issue: SV05, separate final-diagnostic defect. Repository Docker guidance is updated; paired website documentation is ASF doc #517, to be coordinated with this fix. The org comparison includes the already merged launcher baseline from current ASF master.

Change diagram

Separate timeout budgets for partition polling and the final HTTP diagnostic. This conceptual diagram does not replace the validation and scope notes above.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 52.23%. Comparing base (cfc5c23) to head (c6009df).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3316      +/-   ##
============================================
- Coverage     52.24%   52.23%   -0.01%     
- Complexity     2274     2636     +362     
============================================
  Files           762      762              
  Lines         67399    67399              
  Branches       9138     9138              
============================================
- Hits          35211    35208       -3     
+ Misses        28649    28647       -2     
- Partials       3539     3544       +5     

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