passepartout: v0.5.0 File Reorganization

Extract non-core fragments using self-repair criterion:
- core-context -> symbolic-awareness (224 lines, fboundp guards in think())
- heartbeat generation -> symbolic-events (renamed events-start-heartbeat)

Rename 23 files for clarity and new naming scheme:
- 6 core: core-package, core-transport, core-pipeline,
          core-perceive, core-reason, core-act
- 13 system: symbolic-*, neuro-*, embedding-*, channel-shell
- 4 gateway: channel-cli, channel-tui-*, channel-tui-state

Utility relocations:
- markdown-strip -> programming-markdown
- plist-keywords-normalize -> programming-lisp
- cognitive-tool-prompt -> programming-tools
- VAULT-MEMORY -> security-vault
- Merge *backend-registry* into *probabilistic-backends*

Split gateway-messaging into channel-telegram/channel-signal/
channel-discord/channel-slack (4 independent skills)

Delete dead system-model.lisp (16-line wrapper)

Document self-repair criterion in DESIGN_DECISIONS

Version bump: 0.4.3 -> 0.5.0

passepartout.asd

@@ -1,24 +1,23 @@
 (defsystem :passepartout
   :name "Passepartout"
   :author "Amr Gharbeia"
-  :version "0.4.3"
+  :version "0.5.0"
   :license "AGPLv3"
   :description "The Probabilistic-Deterministic Lisp Machine"
   :depends-on (:usocket :bordeaux-threads :dexador :uiop :cl-dotenv :cl-ppcre :hunchentoot :ironclad :str :cl-json :uuid)
   :serial t
-  :components ((:file "lisp/core-defpackage")
+  :components ((:file "lisp/core-package")
                (:file "lisp/core-skills")
-               (:file "lisp/core-communication")
+               (:file "lisp/core-transport")
                (:file "lisp/core-memory")
-               (:file "lisp/core-context")
-               (:file "lisp/core-loop-perceive")
-               (:file "lisp/core-loop-reason")
-               (:file "lisp/core-loop-act")
-               (:file "lisp/core-loop")))
+               (:file "lisp/core-perceive")
+               (:file "lisp/core-reason")
+               (:file "lisp/core-act")
+               (:file "lisp/core-pipeline")))
 
 (defsystem :passepartout/tui
   :depends-on (:passepartout :croatoan :usocket :bordeaux-threads)
   :serial t
-  :components ((:file "lisp/gateway-tui-model")
-               (:file "lisp/gateway-tui-view")
-               (:file "lisp/gateway-tui-main")))
+  :components ((:file "lisp/channel-tui-model")
+               (:file "lisp/channel-tui-view")
+               (:file "lisp/channel-tui-main")))