reduce collision

[benjibc]

Note

Expand human-readable IDs to 6-digit numeric suffix and update tests, adding a fallback EchoEnv import for OpenEnv tests.

• human_id:
  • Expand ID format from adjective-noun-NN to adjective-noun-NNNNNN.
  • Update deterministic index mapping, range checks, and formatting to 6 digits; num_combinations() now multiplies by 1_000_000.
• Tests:
  • Update tests/test_human_id.py to expect 6-digit numeric suffix and new index rollover points.
  • In tests/pytest/test_openenv_echo_hub.py, wrap EchoEnv import in try/except and provide a dummy EchoEnv fallback for environments without openenv.

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[dphuang2]

😮 there were collisions? thanks for the fix