feat(config): Switch work order files from JSON to YAML

[Ishan1923]

Closes #86

This pull request migrates the work order description files from JSON to YAML format, as proposed in issue #86.

GenAI Use

We follow OSRA's policy on GenAI tools

• I used a GenAI tool in this PR.
• I did not use GenAI

Generated-by: Gemini 2.5 pro

[aaronchongth]

Thanks for the contribution! Please also update the tests in https://github.com/osrf/nexus/tree/main/nexus_demos, which intakes the work orders

There is some flakiness in our integration testing CI at the moment, which is being looked into #115. You can run the tests locally too, by sourcing the workspace, navigating to the nexus_demos repository, and running RMW_IMPLEMENTATION=rmw_cyclonedds_cpp python3 -m unittest

[Ishan1923]

Hi @aaronchongth,

Apologies for the delay in getting these updates to you, and thanks again for the detailed review.

I have now pushed the latest changes addressing all your feedback. Here is a quick summary of the work done:

• The test scripts in nexus_demos have been updated to use and parse the new .yaml work order files.
• python3-yaml has been added as a dependency to the nexus_demos package.xml.
• The EOF nitpicks in the three .yaml config files have been corrected.
• The filename reference in the disabled test file (test_parallel_pick_and_place_rmf.py.disabled) has been fixed.

The CI checks should all be passing now. Could you please take another look when you have a moment?

Best,
Ishan

[aaronchongth]

Thanks for the changes, I have left a few more comments.

We have not made the necessary changes to the github repository template yet, but could you also declare in your PR description if Generative AI tools were used for this PR, per OSRA policy https://discourse.openrobotics.org/t/osrf-adopts-policy-on-use-of-generative-ai-in-contributions/43685, and if so, what tool.

You can add and fill up this block

### GenAI Use
We follow [OSRA's policy on GenAI tools](https://github.com/openrobotics/osrf-policies-and-procedures/blob/main/OSRF%20Policy%20on%20the%20Use%20of%20Generative%20Tools%20(%E2%80%9CGenerative%20AI%E2%80%9D)%20in%20Contributions.md)

- [ ] I used a GenAI tool in this PR.
- [ ] I did not use GenAI

Generated-by:

[aaronchongth]

Suggested change

	state: "state_1"
	state: "state_1"

EOF lines cannot have white spaces

[aaronchongth]

Suggested change

	state: "state_1"
	state: "state_1"

EOF lines cannot have white spaces

[aaronchongth]

Suggested change

	state: "state_1"
	state: "state_1"

EOF lines cannot have white spaces

[aaronchongth]

Remove stale comment

[Ishan1923]

Hi @aaronchongth,

I've just pushed the latest updates addressing your feedback. The stale comments and extra whitespace have been removed from the YAML files, and I've also added the GenAI declaration to the pull request description.

Could you please take another look when you have a moment?

Thanks!