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/symbolic-events.lisp

@@ -1,4 +1,4 @@
-(defpackage :passepartout.system-event-orchestrator
+(defpackage :passepartout.symbolic-events
   (:use :cl :passepartout)
   (:export
    :orchestrator-register-hook
@@ -13,7 +13,7 @@
    :*cron-registry*
    :*tier-classifier*))
 
-(in-package :passepartout.system-event-orchestrator)
+(in-package :passepartout.symbolic-events)
 
 (defvar *hook-registry* (make-hash-table :test 'equal)
   "Maps hook property string → list of gate function symbols.")
@@ -214,7 +214,7 @@ and registers them. Scans ~/memex/projects/ and ~/memex/system/ by default."
                   (list :type :EVENT :payload (list :sensor :heartbeat :unix-time (get-universal-time))))))
            :name "passepartout-heartbeat"))))
 
-(defskill :passepartout-system-event-orchestrator
+(defskill :passepartout-symbolic-events
   :priority 80
   :trigger (lambda (ctx)
              (eq (getf (getf ctx :payload) :sensor) :heartbeat))