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

ai/context/people/quy-mai.md

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+# Quy Mai
+
+## Role
+
+Scrum/contact point repeatedly involved in backlog and process management.
+
+---
+
+## Known Context
+
+- Repeatedly asked for clearer Jira/state management, points, and backlog hygiene
+- Often confirmed whether work should remain in backlog, be canceled, or be reframed as separate stories
+- Relevant for sprint structure, story cleanup, and expectation-setting around what counts as production or release-priority work
+
+---
+
+## Guidance
+
+- Treat Quy as an important source for process expectations, backlog cleanup, and story framing
+- If future context clarifies the formal title/team, update this file directly