0.12.0: Shared Fast Mode and Pi 1.0 Baseline

• Requires Pi ≥1.0.0 across the coding-agent, AI and agent-core peers; previous hosts are outside this release's compatibility contract.
• Added argument-free, persistent per-model /fast for the openai-codex provider with no model-ID allowlist or Fast-specific auth gate. @llblab/pi-command-fast@^0.1.0 coordinates one command alongside Claude Usage across duplicate library copies, separate sessions and reloads; generic JSONC editing moved to that normal library. Enabled stores only serviceTier: "priority"; OFF removes the property.
• Enabled Fast adds service_tier: "priority" to eligible Codex requests only when no tier is already present, and appends fast to the existing terminal status in the same dim theme color as its reset countdown, with immediate redraw and no success notification. State follows model selection and survives restart; the loading renderer tracks the newly selected model so an old timer cannot restore its previous suffix. Quota coordination and the Telegram status row are unchanged.
• Split the monolithic entrypoint into an explicit domain DAG under lib/. index.ts only re-exports the composition root in lib/extension.ts and previous public contracts. The quota store, provider transport, normalized report, status lifecycle/format, Telegram adapter, and Fast override have separate owners; tests now live in tests/ with domain-matched names.