[perf] feat: simplify precision_debugger config behavior and docs

[Tjh-UKN]

Summary

This PR aligns and simplifies PrecisionDebugger integration and documentation.

Changes

• Align PrecisionDebugger profiling behavior with global profiler controls.
• Simplify precision_debugger config behavior and usage guidance.
• Improve PrecisionDebugger docs with practical msprobe config.json examples (statistics and tensor) and simple CLI enablement examples.

Why this is not duplicate work

• Checked existing open PRs for this head/base and did not find an existing open PR from Tjh-UKN:main to verl-project/verl:main.

Tests run

• python -m py_compile verl/utils/profiler/config.py verl/utils/profiler/profile.py verl/utils/profiler/precision_debugger_profile.py
• Result: pass

fix #5985

Test Result

tree /data01/tjh/verl/outputs/precision_debug_SIMP/step_1/
/data01/tjh/verl/outputs/precision_debug_SIMP/step_1/
├── actor_compute_log_prob
│ └── step0
│ ├── rank0
│ │ └── dump.json
│ └── rank1
│ └── dump.json
├── actor_update
│ └── step0
│ ├── rank0
│ │ └── dump.json
│ └── rank1
│ └── dump.json
└── ref_compute_log_prob
└── step0
├── rank0
│ └── dump.json
└── rank1
└── dump.json

12 directories, 6 files

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[gemini-code-assist]

Code Review

This pull request simplifies the configuration of the msprobe Precision Debugger by centralizing step filtering and output path management. Redundant fields such as data_dir and tool-specific steps have been deprecated or removed in favor of global_profiler.save_path and global_profiler.steps. Additionally, rank filtering for msprobe is now delegated to its internal config.json, ensuring the verl-side rank gate remains open when the tool is enabled. I have no feedback to provide.

[Tjh-UKN]

@tardis-key I have simplified the usage, please review.

[tardis-key]

Thank you for your quick response!
This PR has handled Examples for command-line startup and Configuration Optimization, so what about Msprobe Installation?