Wmo paramids

[simondsmart]

Description

Contributor Declaration

By opening this pull request, I affirm the following:

• All authors agree to the Contributor License Agreement.
• The code follows the project's coding standards.
• I have performed self-review and added comments where needed.
• I have added or updated tests to verify that my changes are effective and functional.
• I have run all existing tests and confirmed they pass.

[Copilot]

Pull request overview

Adds a new MARS language decision record describing how to handle short-name ambiguity for new WMO-unit paramids (including an explicit units= post-processing keyword concept), and updates the MARS language ADR index/statuses accordingly.

Changes:

• Mark MARS-007 as Accepted in both the index and the decision record status line.
• Add new decision record MARS-008 (“WMO Units”) proposing an approach for short-name handling and on-the-fly unit coercion.
• Add MARS-008 to the MARS language README index.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

File	Description
MARS language/README.md	Updates the ADR index to reflect MARS-007 acceptance and add MARS-008.
MARS language/MARS-007-Timespan-Absence.md	Updates the ADR status line to Accepted.
MARS language/MARS-008-WMO-Units.md	Introduces a new ADR proposing handling/UX for WMO-unit paramid transitions and a units= concept.

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