IDEX l1b event msg product

[lacoak21]

Change Summary

closes #2844

Overview

Produce the l1b event message product. See #2844 for more details.

File changes

Decode IDEX EVT packets into an L1A messages string variable using a JSON template/dictionary file.
Add descriptor-based IDEX L1B processing to generate an l1b_msg dataset with pulser_on/science_on.
Update L2B science-acquisition uptime logic to consume l1b_msg and adjust tests/config accordingly.

Testing

[Copilot]

Pull request overview

Adds support for producing IDEX event message (“msg”) products, including decoding raw event message packets into human-readable strings at L1A and deriving simple on/off flags at L1B, then wiring those into downstream L2B uptime calculations and updating CDF metadata + tests.

Changes:

• Decode IDEX EVT packets into an L1A messages string variable using a JSON template/dictionary file.
• Add descriptor-based IDEX L1B processing to generate an l1b_msg dataset with pulser_on/science_on.
• Update L2B science-acquisition uptime logic to consume l1b_msg and adjust tests/config accordingly.

Reviewed changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
imap_processing/idex/idex_l1a.py	Builds L1A msg dataset with rendered messages strings using decoding dictionaries/templates.
imap_processing/idex/evt_msg_decode_utils.py	New helper to render event templates with embedded params + dictionary decoding.
imap_processing/idex/idex_evt_msg_parsing_dictionaries.json	Adds the event template + decode dictionaries used by rendering.
imap_processing/idex/idex_l1b.py	Introduces descriptor-based dispatch and idex_l1b_msg to derive pulser_on / science_on.
imap_processing/idex/idex_l2b.py	Consumes msg-derived science_on events to compute daily uptime percentages.
imap_processing/cli.py	Updates IDEX CLI processing for descriptor-based L1B and msg descriptor usage in L2B deps.
imap_processing/idex/idex_constants.py	Removes now-unused IDEXEvtAcquireCodes.
imap_processing/cdf/config/imap_idex_l1a_variable_attrs.yaml	Adds messages variable attributes.
imap_processing/cdf/config/imap_idex_l1b_variable_attrs.yaml	Adds pulser_on and science_on variable attributes.
imap_processing/cdf/config/imap_idex_global_cdf_attrs.yaml	Renames global attribute blocks from *_evt to *_msg.
imap_processing/tests/idex/conftest.py	Updates fixtures for msg datasets and new idex_l1b(..., descriptor) API.
imap_processing/tests/idex/test_idex_l1a.py	Renames EVT test to MSG test and validates decoded messages against CSV.
imap_processing/tests/idex/test_idex_l1b.py	Adds test coverage for L1B msg processing outputs.
imap_processing/tests/idex/test_idex_l2a.py	Updates L1B call to include descriptor.
imap_processing/tests/idex/test_idex_l2b.py	Updates uptime tests to use science_on events directly from msg product.
imap_processing/tests/idex/test_idex_l0.py	Renames EVT fixture usage to MSG.
imap_processing/tests/external_test_data_config.py	Updates IDEX L1B example H5 test data version.
imap_processing/tests/idex/test_data/idex_event_messages.csv	Adds example message strings for validation.

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[lacoak21]

This has been tested successfully locally and in dev.

[tech3371]

I looked at L1B and L2B code. Those changes looks good to me. again minor comments and future work.

[tech3371]

LGTM!