Harden dashboard, graph validation, and artifact hygiene

[stevesolun]

Summary

• harden dashboard LAN URL output and sanitize local docs HTML rendered in ctx-monitor
• update dashboard docs for manage/config/docs/harness routes and mutation APIs
• make graph artifact pruning LFS-only by default and document exact release artifact staging
• reject out-of-range graph score components in graph.json and entity overlays
• update generated test counts to 3,907

Validation

• python -m pytest -q --no-cov src\tests\test_validate_graph_artifacts.py src\tests\test_resolve_graph_queries.py src\tests\test_incremental_attach_calibration.py src\tests\test_incremental_attach_az_flow.py src\tests\test_wiki_queue_worker.py src\tests\test_vector_index.py src\tests\test_edge_scoring.py src\tests\test_recommendations.py src\tests\test_recommendation_surfaces_golden.py src\tests\test_kpi_dashboard.py src\tests\test_ctx_monitor.py src\tests\test_graph_artifact_guard.py
• python src\validate_graph_artifacts.py --graph-dir graph --deep --min-nodes 100000 --min-edges 2000000 --min-skills-sh-nodes 89000 --min-semantic-edges 1000000 --expected-nodes 102928 --expected-edges 2913960 --expected-semantic-edges 1683193 --expected-harness-nodes 207 --expected-skills-sh-nodes 89471 --expected-skills-sh-catalog-entries 89465 --expected-skills-sh-converted 89465 --expected-skill-pages 91464 --expected-agent-pages 467 --expected-mcp-pages 10790 --expected-harness-pages 207
• dashboard A-Z smoke against real user profile: all main pages/APIs 200, graph APIs returned 20 nodes/19 edges
• python scripts\ci_preflight.py --profile pr