exp: add pagerankv (weighted PageRank)

[shahar-biron]

Adds experimental weighted PageRank vector scoring as flex.exp.pagerankv.

• Supports weighted transitions via weightAttribute (default: weight).
• Adds buildDirectedAdjacency helper for directed adjacency construction.
• Includes integration test and documentation.

Testing:

• FLEX_USE_LOCAL_FALKORDB=1 npm test

Co-Authored-By: Warp agent@warp.dev

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch exp-pagerankv

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