Implement the canonical senf pln parser

[danielbirhanu]

• Built the canonical SENF PLN parser around the main SENF/TransWeave ideas from the research paper.
• Added occurrence-level entity tracking with supporting and conflicting identity evidence.
• Introduced contextual exemplars and ranked, cost-aware TransWeaves.
• Added grounded SENF admission and predicate-family compatibility checks.
• Added transport-based truth-value degradation and optional identity/predicate bridge atoms.
• Persisted SENF context through the vector store for cross-session resolution.
• Prevented cumulative query and weave contamination across benchmark cases.
• Integrated SENF signals into query scoring, configuration, and telemetry.
• Added focused regression tests; all 322 tests pass.
• Stress25 proof coverage improved over the canonical PLN baseline, while remaining answer-quality limitations are documented.