Follow the reorganized example folders and unified command-line flags.

[Milotrince]

Companion to the examples cleanup in genesis-world, which groups every example under a feature folder and
puts all of them on one command-line convention. Without this, the affected links 404 and the copy-pasteable
commands silently stop working.

Paths that moved

Was	Now
examples/IPC_Solver/	examples/ipc/
examples/smoke.py	examples/fluid/smoke.py
examples/differentiable_push.py	examples/deformable/differentiable_push.py
examples/ddp_multi_gpu.py	examples/rigid/ddp_multi_gpu.py

Flags that changed

Long option names now use dashes between words, and the environment count is -b everywhere (it was -B in
the training guides):

• -B 8192 -> -b 8192
• --max_iterations -> --max-iterations
• -B/--num_envs -> -b/--num-envs
• -e/--exp_name -> -e/--exp-name
• --use_force -> --use-force

Python attribute names are unaffected (argparse maps dashes to underscores), so the embedded code excerpts
that read args.steps, args.num_envs and args.vis stay correct as written.

Verification

Every examples/... path referenced anywhere under source/ was resolved against the reorganized tree: all
73 file links and all 13 directory links point at something that exists. The two unresolved hits,
01_hello_nyx.py and 05_gaussian_splat.py, live in genesis-nyx and are out of scope.

Merge order

This should land after the genesis-world PR, since the links target blob/main/examples/... at the new
locations.

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[claude]

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