rename: remaining Bouncer mentions → Dispatcher

- BOUNCER-PRIVACY-TAGS → *DISPATCHER-PRIVACY-TAGS*
- BOUNCER-SHELL-TIMEOUT → *DISPATCHER-SHELL-TIMEOUT*
- BOUNCER-SHELL-MAX-OUTPUT → *DISPATCHER-SHELL-MAX-OUTPUT*
- bouncer-privacy-tags docstrings → Dispatcher privacy tags
- 'Bouncer' in log messages, docstrings, test descriptions
- 'Bouncer Security Dispatcher' → 'Security Dispatcher'

org/security-validator.org

@@ -25,7 +25,7 @@ before they reach any cognitive stage.
 ** Boundaries
 
 - Does NOT define the schema — that is ~core-communication.org~.
-- Does NOT validate semantic content — that is the Bouncer and Policy.
+- Does NOT validate semantic content — that is the Dispatcher and Policy.
 
 * Implementation