AUD-117: derive person from the question via project people list

Decode the people list from each project's /capabilities and set the /ask
person field from a whole-word, case-insensitive name in the question when
the caller did not name a person. Match only the routed project's people,
so a name from another project does not leak across. Fall back to asker
when no name matches.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

docs/outline/03-code-map.md

@@ -32,7 +32,7 @@ central_ai_llm_master/
     ids/                    ULID request and approval ids
     config/                 environment and secrets loading
     hear/                   step 1: decode and validate the request
-    understand/             step 2: never-route check and the routing LLM
+    understand/             step 2: never-route check, person match, routing LLM
     check/                  step 3: identity and source checks
     route/                  step 4: dispatch to one destination
     answer/                 step 5: reply shaping (text, speech, notify)