Implement DAX-01 DevRel agent architecture

[google-labs-jules]

• Implement _log_symbolic_scar with VSA hypervectors and classification in dax_agent.py.
• Add novice detection to _observe to dynamically adjust the SSI threshold in dax_agent.py.
• Refactor _output to ensure rigorous output templates for Quickstart, FrictionReport, and TriageResponse.
• Implement run_debridement_cycle (SagaRecovery) for pruning symbolic scars.
• Add ADR 38 formalizing the DAX-01 Epistemic Capsule.
• Update LEXICON.md and README.md to reflect DAX-01 domain knowledge.

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PR created automatically by Jules for task 2095022038159567559 started by @projectedanx

[google-labs-jules]

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