feat(ilamb): add CMIP7 data support to ILAMB diagnostics

[lewisjared]

Description

Add CMIP7 data support to ILAMB diagnostic providers, enabling diagnostics to run against either CMIP6 or CMIP7 datasets.

CMIP7 Test Case Status

ILAMB

• gpp-WECANN
• gpp-FLUXNET2015
• mrro-LORA
• mrsos-WangMao
• cSoil-HWSD2
• lai-AVH15C1
• nbp-Hoffman
• snc-ESACCI
• burntFractionAll-GFED

Checklist

Please confirm that this pull request has done the following:

• Tests added
• Documentation added (where applicable)
• Changelog item added to changelog/

[codecov]

Codecov Report

❌ Patch coverage is 73.80952% with 11 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...limate-ref-ilamb/src/climate_ref_ilamb/standard.py	73.80%	7 Missing and 4 partials ⚠️

Files with missing lines	Coverage Δ
...limate-ref-ilamb/src/climate_ref_ilamb/standard.py	90.35% <73.80%> (-4.59%)	⬇️

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[Copilot]

Pull request overview

Adds CMIP7 support to the ILAMB diagnostic provider so ILAMB diagnostics can run against either CMIP6 catalogs or CMIP7 catalogs (via branded variable name filtering and CMIP7-specific facet handling).

Changes:

• Extend the CMIP6→CMIP7 Data Request subset with additional ILAMB-relevant variables and update the extraction script’s included variable list.
• Update ILAMB Standard diagnostic wiring to support dual CMIP6/CMIP7 DataRequirements, branded variable lookups, and CMIP7 facet normalization (variant_label ↔ member_id).
• Add/adjust ILAMB configuration and a changelog entry (including per-diagnostic test source_id override for burntFractionAll-GFED).

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
scripts/extract-data-request-mappings.py	Expands the included variable IDs used when generating the bundled CMIP6→CMIP7 mapping subset.
packages/climate-ref-ilamb/src/climate_ref_ilamb/standard.py	Implements CMIP7-aware ILAMB requirements, branded-name lookup, selector normalization, and CMIP7 test cases.
packages/climate-ref-ilamb/src/climate_ref_ilamb/configure/ilamb.yaml	Adds a per-diagnostic test_source_id override for the burntFractionAll case.
packages/climate-ref-core/src/climate_ref_core/data/cmip6_cmip7_variable_map.json	Adds new Data Request mapping entries for ILAMB-used variables (land + ocean).
changelog/535.feature.md	Documents the user-facing CMIP7 support addition for ILAMB diagnostics.

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[Copilot]

In _get_branded_variable_names, once a mapping is found for a variable in the preferred table order, the loop continues through the remaining tables and can append additional branded names for the same var_id. This can lead to duplicate/mixed branded variable filters and may match the wrong branding if a variable exists in multiple tables. Consider breaking out of the inner loop after the first successful get_dreq_entry (and optionally deduplicating the final list).

Suggested change

	branded.append(entry.branded_variable_name)
	found = True
	except KeyError:
	continue
	if not found:
	logger.debug(f"No CMIP7 branded variable name found for {var_id}")
	return tuple(branded)
	except KeyError:
	continue
	branded.append(entry.branded_variable_name)
	found = True
	# Once a mapping is found in the preferred table order,
	# stop searching additional tables for this variable.
	break
	if not found:
	logger.debug(f"No CMIP7 branded variable name found for {var_id}")
	# Deduplicate while preserving order, in case multiple inputs map
	# to the same branded variable name.
	return tuple(dict.fromkeys(branded))