fix: add space after # in CMR CARE agent markdown headings

[rohit-sahoo]

Issue:
Bug Ticket: Agent chat streams malformed markdown heading syntax

What changes I have made:

• Added explicit markdown formatting instruction to the CMR CARE agent system prompt in akd_ext/agents/cmr_care.py. The instruction tells the LLM to always include a space after # characters in headings

How to test:

• Set OPENAI_API_KEY in .env
• Uncomment test_cmr_care_agent_markdown_heading_format in tests/agents/test_cmr_care.py
• Run below command:

uv run pytest "tests/agents/test_cmr_care.py::test_cmr_care_agent[Find datasets related to sea surface temperature in the Pacific Ocean]" -s -o "addopts="

(above test simply ignores the default pytest flags from config and simply runs this single test)

• Optionally uncomment test_cmr_care_agent_markdown_heading_format in test_cmr_care.py to run the automated regex check

[muthukumaranR]

why is it commented out?

[rohit-sahoo]

I assumed we have a CI setup in this repo and the test needs OPEN_AI_API_KEY to run the test, so I commented it out, but there are no CI set up here.