heph.nvim: task views — next/list/capture/attention/state/log (slice 11b)

Backend: enrich `list` to return titled RankedTask rows (title +
canonical_context_id, via a shared ranked_from_row with `next`), so the
Organizational view needs no N+1 node.get. TDD: query_surface test asserts
list rows carry title + context id.

Plugin:
- view.lua: Tactical `next` + Organizational `list` rendered scratch buffers;
  <CR> opens the row's canonical-context doc. Narrowed the node autocmd to
  heph://node/* so view buffers (heph://next, heph://list) don't trip it.
- task.lua: capture, set-attention, done/drop, skip, per-task log append, all
  resolving "the current task" from the buffer (a task node, or a context doc
  via its canonical-context backlink).
- picker.lua: vim.ui.select with Telescope auto-upgrade (headless-safe).
- command.lua: :Heph next/list/capture/attention/done/drop/skip/log/search.

e2e: capture→next→open context→add/check checklist→done; recurring
fresh-checklist (complete rolls forward in place, next occurrence all-unchecked
— the §4.4 hard requirement). 6 specs green via `mise run test-nvim`.

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

heph.nvim/lua/heph/config.lua

@@ -33,7 +33,15 @@ function M.apply_keymaps(opts)
   map("n", "<leader>hj", function()
     require("heph.journal").open()
   end, { desc = "heph: today's journal" })
-  -- Task/agenda maps are added with their views in slice 11b.
+  map("n", "<leader>hn", function()
+    require("heph.view").next()
+  end, { desc = "heph: what is next (Tactical)" })
+  map("n", "<leader>hl", function()
+    require("heph.view").list()
+  end, { desc = "heph: task list (Organizational)" })
+  map("n", "<leader>hd", function()
+    require("heph.task").set_state_current("done")
+  end, { desc = "heph: mark current task done" })
 end
 
 return M