feat(tui): <Enter> opens the context editor; reorder views (§8.1/§8.2)

- `<Enter>` now opens the selected task's context doc in nvim (App::enter:
  from the sidebar it drills into the task list first); the `o` binding is
  retired. Hint line updated.
- BUILTIN_VIEWS reordered to the owner's preference — Top of Mind, Tasks,
  Work Tasks, Chores, On Deck — which drives the TUI sidebar and
  `heph view`. Tests that walked to On Deck by a fixed offset now seek it
  by title.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/reference/tech-spec.md

@@ -254,7 +254,7 @@ Replaces obsidian.nvim. Telescope-backed. **Primarily the context / knowledge-ba
 
 - **Crate `crates/heph-tui`** ✅ — `ratatui` (which re-exports `crossterm`), a **thin client of the daemon unix socket** (reuse `hephd::Client`); never touches SQLite, same as nvim. `App` is generic over a `Backend` seam so navigation/triage logic is unit-testable without a terminal or daemon; `ui::render` is pure.
 - **Layout** ✅ — three panes: **sidebar** (the five §8.2 filter views + projects) · **task list** (each row: a leading attention **flag** + a **project-colored bullet**, the title, recurrence `↻`, and a compact human do/late chip; a scrollbar appears when the list overflows) · **preview** (canonical-context doc body + `log.tail`).
-- **Gestures** ✅ — `j/k` move · `Tab`/`h`/`l` focus · `a` **single-line NL quick-add** (Todoist-style: `Buy milk tomorrow p2 #Work every week` → title + attention `p1`..`p4` + do-date + `every …` recurrence + `#project`; no `#project` files it under the selected one) · `x` done · `S` skip · `A` cycle attention · `e` reschedule do-date · `b` push-to-blue · `d` drop · `D` **delete/tombstone** (y/N confirm — true soft-delete, recurring included) · `m` **move-to-project** (a list-pick overlay — "(Unfile)" then every project; backed by `task.set_project`) · `s` **sort toggle** (default ↔ project-grouped) · `o` edit context in nvim · `/` **FTS search** (overlay; Enter opens a hit — a task at its context doc — in nvim) · `r` refresh · `q` quit. The sidebar lists the **§8.2 named filter views** — [[design]] §6.2 "filters = saved views" made interactive. Recurring tasks show a **`↻` marker**, and the **selected row expands inline** with a dimmed detail block (project · recurrence rule · do/late). *(Remaining: humanizing the displayed RRULE is later polish.)*
+- **Gestures** ✅ — `j/k` move · `Tab`/`h`/`l` focus · `a` **single-line NL quick-add** (Todoist-style: `Buy milk tomorrow p2 #Work every week` → title + attention `p1`..`p4` + do-date + `every …` recurrence + `#project`; no `#project` files it under the selected one) · `x` done · `S` skip · `A` cycle attention · `e` reschedule do-date · `b` push-to-blue · `d` drop · `D` **delete/tombstone** (y/N confirm — true soft-delete, recurring included) · `m` **move-to-project** (a list-pick overlay — "(Unfile)" then every project; backed by `task.set_project`) · `s` **sort toggle** (default ↔ project-grouped) · `⏎` **edit context in nvim** (from a task; from the sidebar it drills into the list) · `/` **FTS search** (overlay; Enter opens a hit — a task at its context doc — in nvim) · `r` refresh · `q` quit. The sidebar lists the **§8.2 named filter views** — [[design]] §6.2 "filters = saved views" made interactive. Recurring tasks show a **`↻` marker**, and the **selected row expands inline** with a dimmed detail block (project · recurrence rule · do/late). *(Remaining: humanizing the displayed RRULE is later polish.)*
 - **TUI ↔ nvim handoff** ✅ — `o` suspends the alternate screen and launches `nvim +"lua require('heph.node').open('<ctx-id>')"` (heph.nvim's live buffer surface), passing `$HEPH_SOCKET` so the child points at the same daemon, then restores and reloads. *(A nvim command shelling back to the TUI is later polish.)*
 - **Testing** ✅ — TDD against a real daemon; headless render assertions via `ratatui`'s `TestBackend`, plus in-memory navigation/input-flow units against a fake backend.
 - **Prereqs** (landed): **§8.2 filter views**; the CLI-complete task surface and `task.set_schedule`.
@@ -274,10 +274,10 @@ Replaces obsidian.nvim. Telescope-backed. **Primarily the context / knowledge-ba
 | View | Todoist query (origin) | heph realization |
 |---|---|---|
 | **Top of Mind** | `(p1\|p2) & (no date\|today\|overdue)` | `attention ∈ {red,orange}` ∧ actionable |
-| **On Deck** | `p3 & (no date\|overdue\|today)` | `attention = blue` ∧ actionable |
-| **Chores** | `(today\|overdue\|no date) & (#Chores\|#Camano Chores)` | scope ∈ {Chores, Camano Chores} ∧ actionable |
-| **Work Tasks** | `#Work & !p3 & (…) & !subtask` | scope = Work subtree ∧ `attention ≠ blue` ∧ actionable |
 | **Tasks** | `!p3 & (…) & !(#Daily Routine\|#Work Routine\|#Chores\|#Camano Chores\|#Work\|##Culture\|#Camano Info) & !subtask` | `attention ≠ blue` ∧ actionable ∧ **not in** the routine/work/chore projects |
+| **Work Tasks** | `#Work & !p3 & (…) & !subtask` | scope = Work subtree ∧ `attention ≠ blue` ∧ actionable |
+| **Chores** | `(today\|overdue\|no date) & (#Chores\|#Camano Chores)` | scope ∈ {Chores, Camano Chores} ∧ actionable |
+| **On Deck** | `p3 & (no date\|overdue\|today)` | `attention = blue` ∧ actionable |
 
 **Engine work — extend `list` (§6) so a view is a *predicate expressed as data*** (mirroring §7's "order as data"):