Summary

• Bumps neuroconv from 0.6.1 to 0.6.5 in all 4 platform environment files
• Updates NWBMetaDataEncoder imports to use private _NWBMetaDataEncoder (made private in 0.6.2 with no deprecation shim)
• Adds spikeinterface to PyInstaller modules_to_collect in nwb-guide.spec (lazily imported, not detected by PyInstaller)
• Pins pandas < 3.0 to avoid Arrow backend returning read-only arrays that break spikeinterface Phy extractor

Note: In 0.6.5 the ecephys, ophys, behavior, and text extras were restored, so the original extras specification is preserved.

Closes #960

Test plan

• Verify neuroconv 0.6.5 installs correctly on all platforms
• Run LiveServices tests to confirm backend Python integration works
• Run BuildTests to confirm PyInstaller bundles spikeinterface correctly
• Run E2E tutorial tests (note: pre-existing failures on main since ~Nov 15)

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