passepartout: v0.5.0 — File Reorganization & Token Economics

File Reorganization:
- Extracted core-context → symbolic-awareness (skill)
- Extracted heartbeat → symbolic-events (skill)
- Relocated 6 utility fragments, renamed 23 files, deleted system-model.lisp
- Renamed gateway-* → channel-*, split gateway-messaging → 4 channel-* files
- Renamed defskill/defpackage names to match new file prefixes
- Deleted gateway-messaging.org/.lisp, removed core-context filter
- Documented self-repair criterion, added AGENTS.md core boundary rule

Token Economics (v0.5.0, skills not core):
- tokenizer.lisp: count-tokens, model-token-ratio, token-cost, provider-token-cost (11 tests)
- cost-tracker.lisp: cost-track-call, cost-session-total, cost-by-provider (6 tests)
- token-economics.lisp: prompt-prefix-cached, context-assemble-cached,
  enforce-token-budget with CONTEXT_MAX_TOKENS env var (9 tests)

Bug Fixes:
- Fixed DeepSeek 400 (removed malformed tools from cascade)
- Fixed UNDEFINED-FUNCTION crash (fboundp guards in think())
- Fixed gate-trace duplication (setf replaces list* in cognitive-verify)
- Tightened dexador connect-timeout 10s→5s

Test suite: 116/116 (100%)

lisp/neuro-provider.lisp

@@ -62,7 +62,7 @@ When :tools is provided, includes function-calling tool definitions in the reque
          (body-json (cl-json:encode-json-to-string body)))
     (handler-case
         (let* ((response (dex:post url :headers headers :content body-json
-                                  :connect-timeout (min 10 timeout)
+                                  :connect-timeout (min 5 timeout)
                                   :read-timeout (max 10 (- timeout 5))))
                (json (cl-json:decode-json-from-string response))
                (choices (cdr (assoc :choices json)))
@@ -134,7 +134,7 @@ If API-KEY is nil, reads from environment."
 (provider-register-all)
 (provider-cascade-initialize)
 
-(defskill :passepartout-system-model-provider
+(defskill :passepartout-neuro-provider
   :priority 50
   :trigger (lambda (ctx) (declare (ignore ctx)) nil))