Sweep v1.0.0 user docs readiness

[gparadis]

Summary

• Sweep user-facing v1.0.0 docs for copy/paste failures and stale release language.
• Fix README rendering, source-checkout vs PyPI wording, and outdated fhops evaluate / fhops eval-playback examples.
• Move dashboards out of the first Getting Started slot, update v1.0.0 release-note status, and mark old alpha release notes as historical.
• Record findings and deferred follow-ups in notes/docs_readiness_sweep.md.

Testing

• .venv/bin/fhops validate examples/tiny7/scenario.yaml
• .venv/bin/fhops solve-heur examples/tiny7/scenario.yaml --out tmp/docs-readiness/tiny7_sa.csv --iters 25 --seed 7
• .venv/bin/fhops evaluate examples/tiny7/scenario.yaml --assignments tmp/docs-readiness/tiny7_sa.csv
• .venv/bin/ruff format src tests
• .venv/bin/ruff check src tests
• .venv/bin/mypy src
• .venv/bin/pytest (301 passed, 210 skipped, 61 warnings)
• .venv/bin/pre-commit run --all-files
• PANDOC_DIR=... PATH="$PANDOC_DIR:$PATH" .venv/bin/sphinx-build -b html docs _build/html -W

Addresses #27.