feat: Refactor communication context to generalize from Jeff to current manager and enhance people management structure

ai/context/people/README.md

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+# People Context
+
+Store reusable human context here.
+
+Use this directory for:
+
+- who is who
+- current role ownership
+- communication preferences
+- recurring stakeholders
+- stable relationship between people and project work
+
+Guidelines:
+
+- use one file per named person when that person matters repeatedly
+- keep `manager.md` as the role mapping for the current active manager
+- keep `index.md` as the quick roster for the active project
+- do not put secrets here
+- do not invent roles; use qualifiers when uncertain