Add worker diagnostic Bake tasks

[samuel-williams-shopify]

Summary

• add a workers Bake task for listing registered connection IDs
• expose memory_dump, scheduler_dump, thread_dump, garbage_profile_start, and garbage_profile_stop as worker Bake tasks
• add bounded allocation_trace_start and allocation_trace_stop tasks that capture a traced heap and clear allocation metadata
• guard allocation tracing ownership so the tasks do not interfere with an already-active external profiler
• support omitting Ruby SHAPE records from memory dumps with shapes=false for Reap compatibility
• compose the simple example with Managed::Environment so Supervised#prepare! has its expected lifecycle parent
• exercise the Bake tasks end-to-end with a Sus fixture containing a real supervisor, worker, bus proxy, and worker controller
• add a Memory Diagnostics guide covering safe heap capture and dedicated workflows for heap-profiler, sheap, and Reap
• document bounded allocation tracing, GC profiling, scheduler/thread dumps, and a practical leak-investigation workflow
• remove stale memory_sample instructions and regenerate the README guide list and agent documentation context

Validation

• full Sus suite: 68 tests, 199 assertions passing
• focused Bake suite: 7 tests, 19 assertions passing
• RuboCop: 61 files inspected, no offenses
• generated documentation context successfully
• exercised heap-profiler and sheap against real Ruby 4 ObjectSpace.dump_all files
• end-to-end tests verify shapes=false omits SHAPE records and bounded allocation tracing adds source locations then clears metadata
• git diff --check