Tolerate captioned-output schema in explorer datasets

[max-rosenblattl]

Summary

• Make MHCDataset._parse (daily) and WeeklyMHCDataset._parse (weekly) tolerant of the captioned-output schema (sensor-cap-{daily,weekly}-tiny on HF), which lacks a few raw-input fields and renames channel_units -> units.
• Lets the existing explorer.py load either raw HF saved-disk dirs or the captioned shipped configs without code-path branching.

Test plan

• MHC_DATASET_DIR=./sensor-cap-daily-tiny python explorer.py opens, navigates rows, runs detectors live.
• MHC_WEEKLY_DATASET_DIR=./sensor-cap-weekly-tiny python explorer.py --weekly same.
• No regression on raw daily / raw weekly explorer flow.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: c00fb642-e4e7-47ee-8132-d82a32fb2f0a

📥 Commits

Reviewing files that changed from the base of the PR and between 8515a38 and 2e6dcb5.

📒 Files selected for processing (2)

• mhc/dataset.py
• mhc_weekly/dataset.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch max-rosenblattl/explorer-on-captioned-datasets

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