- Added a [[task-lifecycle]] explanation doc: the **two-axis task model** (lifecycle state — outstanding/done/dropped — kept separate from attention white/orange/red/blue), why **On Deck (blue) is not the same as dropped**, what **delete/tombstone** does (and that it keeps the context doc), and where each task shows up across the agenda, full-text search, and export.
- Surface strategy revised to a **three-surface model** ([[design]] §4, tech-spec §1/§8), grounded in a study of the owner's live Todoist usage (387 active tasks, 34 hierarchical projects — [[design]] §6.2.1): the **CLI** is task capture/scripting plus the complete daemon API, a planned **`heph-tui`** terminal UI (tech-spec §8.1) is the primary task agenda/triage surface, and **`heph.nvim`** is the primary context/knowledge-base surface. The study also confirms do-date-not-due-date (zero deadlines used), that task descriptions are already full of unresolved `[[wiki-links]]` (the exact task↔KB fusion heph provides), and surfaces new needs (project hierarchy, natural-language recurrence) while showing tags are negligible.