Docs: GFQL WHERE reference - #914

⚠️ Restack in progress. Do not merge this PR. Replacement PR: #919.

Summary

• Add GFQL WHERE (same-path constraints) docs with a new reference page
• Cross-link WHERE in GFQL overview/quick/predicates/spec/wire/API pages
• Add brief WHERE notes in translation and Cypher mapping guides

Testing

• DOCS_FORMAT=html VALIDATE_NOTEBOOK_EXECUTION=0 ./docs/ci.sh (from docs/; Sphinx reported warnings on notebook copy-overwrite)

Live Docs (PR preview)

Base: https://pygraphistry--914.org.readthedocs.build/en/914/

• New: https://pygraphistry--914.org.readthedocs.build/en/914/gfql/where.html
• Updated:
  • https://pygraphistry--914.org.readthedocs.build/en/914/gfql/index.html
  • https://pygraphistry--914.org.readthedocs.build/en/914/gfql/overview.html
  • https://pygraphistry--914.org.readthedocs.build/en/914/gfql/quick.html
  • https://pygraphistry--914.org.readthedocs.build/en/914/gfql/predicates/quick.html
  • https://pygraphistry--914.org.readthedocs.build/en/914/gfql/performance.html
  • https://pygraphistry--914.org.readthedocs.build/en/914/gfql/translate.html
  • https://pygraphistry--914.org.readthedocs.build/en/914/gfql/spec/language.html
  • https://pygraphistry--914.org.readthedocs.build/en/914/gfql/spec/python_embedding.html
  • https://pygraphistry--914.org.readthedocs.build/en/914/gfql/spec/wire_protocol.html
  • https://pygraphistry--914.org.readthedocs.build/en/914/gfql/spec/cypher_mapping.html
  • https://pygraphistry--914.org.readthedocs.build/en/914/api/gfql/chain.html
  • https://pygraphistry--914.org.readthedocs.build/en/914/api/gfql/hop.html
  • https://pygraphistry--914.org.readthedocs.build/en/914/api/gfql/predicates.html

Stack

• Base: chore(bench): add GFQL benchmarks and CI job #913 (benchmarks)
• Stack note: perf(hop): traversal optimizations and fast path #911/feat(gfql): add same-path WHERE executor #912 are merged into stack branches (not master yet); feat(gfql): add same-path WHERE executor #912 adds col/compare re-exports used in these examples
• Next: (none)