feat: Add historical context files for team members and update project documentation with Slack archive import details

ai/context/people/david-delagneau.md

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+# David Delagneau
+
+## Role
+
+Repeated Fidelity collaborator in historical Slack threads.
+
+---
+
+## Known Context
+
+- Appears heavily in pipeline, Jenkins, SonarQube, test-reporting, and release-process work
+- Later historical activity also includes Sparta SDK proof-of-concept implementation and framework setup work
+- Often provides implementation updates, process notes, and operational debugging context to Jeff
+- Frequently handled CI/CD, Jenkins, reporting, and repo/setup tasks while Norman focused on SDK and consumer debugging
+- Later archive activity shows him taking lead on SpartaSDK setup, JSON decoding, and repo/bootstrap work
+
+---
+
+## Guidance
+
+- Treat David as a relevant source for CI/CD, release-process, and framework-setup context
+- Treat David as especially relevant for Jenkins, SonarQube, Pod/repo setup, and Sparta SDK bootstrapping context
+- If future context clarifies the formal role or team, update this file directly