docs: note uv PATH gotcha for Cursor Cloud setup

[svvarom]

Summary

Sets up the Cloud Agent development environment for NeMo Platform and records one non-obvious caveat discovered during setup.

The dependency-refresh layer (install pinned uv, uv sync --frozen --all-packages) is captured in the Cloud Agent update script. This PR only adds a durable note to AGENTS.md: the pip-installed uv binary lands in ~/.local/bin, which is on PATH for login shells but not the default non-login tool shell. ~/.local/bin was added to ~/.bashrc so interactive shells resolve it.

Environment verification

Bootstrapped with make bootstrap-python (uv sync), then started all services via nemo services run --service-group all.

• Lint: uv run ruff check -> All checks passed
• Tests: make test-package PACKAGE=nmp_common -> 1029 passed, 1 failed (pre-existing, Docker-dependent config test; documented in AGENTS.md)
• Health: curl /health/ready -> {"status":"ready"}
• Hello-world task: created workspace cursor-smoke via the CLI and confirmed it persists in nemo workspaces list

nemo_env_smoke.log

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[github-actions]

Suite	Lines Covered	Line Rate	Branch Rate
Unit Tests	20908/27474	76.1%	61.2%
Integration Tests	12109/26243	46.1%	19.5%