Fix release docs and Chrysalis YAC smoke

[rajeeja]

Summary

• Fix config discovery docs to match the actual env -> cwd config -> user config -> editable fallback order.
• Update architecture docs/HTML for the unified tool surface instead of stale conditional *_hpc tools.
• Clarify conda-forge scope as core-only for the initial recipe, with HPC as a future output/variant.
• Harden Chrysalis endpoint setup and diagnostics, including YAC runtime paths, log helpers, and Slurm YAC smoke checks.
• Fix Chrysalis YAC smoke by running native YAC/MPI import/remap in a worker-side srun --ntasks 1 subprocess, and avoid native YAC imports in the generic runtime probe.

Validation

• uv run pre-commit run --all-files
• uv run pytest tests/ --ignore=tests/test_remote_agent.py -q -> 292 passed
• uv run --extra hpc pytest tests/test_remote_agent.py tests/test_hpc_safety.py -q -> 44 passed
• uv run --extra docs sphinx-build -b html docs docs/_build/html -W --keep-going
• rm -rf dist && uv build && uvx twine check dist/*
• conda-build -c conda-forge conda/recipe --no-anaconda-upload
• Chrysalis endpoint worker probe: active on Slurm, Python 3.12.13, expected YAC PYTHONPATH recognized
• uv run --extra hpc python scripts/yac_smoke_test.py --endpoint chrysalis --timeout-seconds 300 -> yac_core_ok=true, yac_helper_ok=true, remap_ok=true, launch_mode=srun, remap shape [768]