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%)

README.org

@@ -115,7 +115,7 @@ Features marked =Stable= ship in the current release. Features marked =Planned=
 | Structured output (function-calling) | Stable | v0.4.2 | LLM tool use via native function-calling API, JSON→plist boundary |
 | Shell sandbox (bwrap)               | Stable | v0.4.3 | Bubblewrap namespace isolation, network/IPC lockdown   |
 | Shell severity classification        | Stable | v0.4.3 | catastrophic→dangerous→moderate→harmless tier system   |
-| Token economics + cost tracking   | Planned  | v0.5.0  | Per-session cost counter, prompt caching, budget enforcement         |
+| Token economics + cost tracking   | Stable   | v0.5.0  | Per-session cost counter, prompt caching, budget enforcement         |
 | Priority-queue signal processing  | Planned  | v0.6.0  | Preempts background for user interactions                            |
 | MVCC memory concurrency           | Planned  | v0.6.1  | Concurrent reads/writes on Merkle tree                               |
 | Structured output enforcement     | Planned  | v0.6.2  | Plist validation with retry and feedback                             |