docs: analytics guide, installation extras, and use-case doc fixes

[DecisionNerd]

Summary

• New docs/guide/analytics-integration.md covering to_dicts, to_dataframe, to_networkx, to_igraph, to_json/from_json, schema introspection, and a method-selection table
• docs/getting-started/installation.md: adds all optional extras (pandas, networkx, igraph, analytics, zstandard) with descriptions; bumps version to 0.3.10
• examples/05_migration_from_networkx.py: replaces "future feature" placeholder with working to_networkx() demo
• docs/use-cases/knowledge-graph-construction.md: adds add_graph_documents() section, CREATE-vs-MERGE idempotency warning, and fixes shortestPath reference to show NotImplementedError with BFS workaround
• Research docs updated to mark resolved: engine bugs (PRs fix: ORDER BY on aliased RETURN DISTINCT property no longer raises #494, fix: variable reuse across WITH boundary no longer crashes #495) and API gaps (PRs fix: shortestPath() / allShortestPaths() parse and raise NotImplementedError #497, feat: schema introspection API — labels(), relationship_types(), node_count(), relationship_count() #499, feat: JSON export/import API — to_json() and from_json() #500, feat: add_graph_documents() LangChain-compatible ingestion #502) reflected in pass/fail matrices for agent-grounding, kg-construction, llm-workflows, and network-analysis

Closes #453
Closes #454
Closes #455
Closes #456
Closes #457
Closes #473
Closes #503

Test plan

• make pre-push passes (✅ confirmed locally — 87.2% total coverage)
• Verify docs/guide/analytics-integration.md renders correctly in mkdocs
• Verify code snippets in new guide match shipped API signatures

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[coderabbitai]

Important

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• docs/research/kg-construction.md is excluded by !**/*.md, !**/docs/**
• docs/research/llm-workflows.md is excluded by !**/*.md, !**/docs/**
• docs/research/network-analysis.md is excluded by !**/*.md, !**/docs/**
• docs/use-cases/knowledge-graph-construction.md is excluded by !**/*.md, !**/docs/**
• examples/05_migration_from_networkx.py is excluded by !**/examples/**

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✨ Finishing Touches

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• Create PR with unit tests
• Commit unit tests in branch docs/454-457-analytics-docs

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.10%. Comparing base (938c148) to head (8250f13).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #505   +/-   ##
=======================================
  Coverage   88.10%   88.10%           
=======================================
  Files          40       40           
  Lines       14730    14730           
  Branches     3481     3481           
=======================================
  Hits        12978    12978           
  Misses       1146     1146           
  Partials      606      606           

Flag	Coverage Δ
full-coverage	88.10% <ø> (ø)

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Components	Coverage Δ
parser	95.49% <ø> (ø)
planner	83.07% <ø> (ø)
executor	83.63% <ø> (ø)
storage	91.25% <ø> (ø)
ast	98.22% <ø> (ø)
types	94.75% <ø> (ø)

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