feat: REPL development tool + naming drift fixes + HITL gateways

REPL tool:
- ~/.opencode/bin/repl — connects to running daemon, evaluates Lisp forms,
  returns results. Usage: repl '(+ 1 2)' or via stdin.
- Server-side handler in programming-repl skill registers for :repl-eval
  sensor, bypasses LLM pipeline, writes result back through reply-stream.
- Core provides pre-reason-handler registry (register-pre-reason-handler)
  for skills to register custom sensors without modifying core code.

HITL gateway integration:
- hitl-handle-message: TUI, Telegram, and Signal gateways intercept
  approval/deny commands before they reach the LLM.
- hitl-create/hitl-approve/hitl-deny: in-memory HITL store with correlation
  tokens for gateway-agnostic approval.
- loop-gate-perceive detects HITL commands and blocks LLM processing.

Naming drift fixes (the complete batch):
- register-actuator vs actuator-register — fixed to register-actuator
- process-signal vs loop-process — alias added
- perceive-gate/reason-gate/act-gate vs loop-gate-* — aliases added
- initialize-actuators vs actuator-initialize — fixed to actuator-initialize
- initialize-all-skills vs skill-initialize-all — fixed to skill-initialize-all
- inject-stimulus alias added for backward compatibility
- All original gateway-manager inject-stimulus → stimulus-inject + HITL check

org/core-loop-reason.org

@@ -281,6 +281,10 @@ The retry limit prevents infinite loops. If the LLM cannot produce a passable pr
 
 ;; REPL-VERIFIED: 2026-05-03T13:00:00
 #+begin_src lisp
+;; Alias: reason-gate → loop-gate-reason
+(defun reason-gate (signal)
+  (loop-gate-reason signal))
+
 (defun loop-gate-reason (signal)
   (let* ((type (proto-get signal :type))
          (payload (proto-get signal :payload))