chore(bin/up): DEBUG=1 writes LLM debug logs to /app/logging (host: logging/)

Add a DEBUG=1 convenience flag to bin/up that turns on full LLM debug logging
(DISPATCH_DEBUG_LLM) plus the per-step usage/cache split (DISPATCH_DEBUG_USAGE)
and routes the JSON request/response files into the container's /app/logging,
which maps to the project-root logging/ dir on the host via the existing .:/app
bind mount. This makes it easy to verify cache hits (including the prompt-cache
warming replay) without docker exec.

- bin/up: DEBUG=1 sets DISPATCH_DEBUG_LLM/_USAGE=1 and DISPATCH_DEBUG_LLM_DIR=
  /app/logging as DEFAULTS (explicit DISPATCH_DEBUG_* still win). Pre-creates
  the host log dir; /app/* targets are already host-owned so no sudo chown,
  while the /tmp fallback keeps its ownership fix.
- docker-compose.yml: forward DISPATCH_DEBUG_LLM_DIR into the api container.
- .gitignore: ignore logging/.

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