feat(org-config): add cj/org-finalize-task with tests

I added a command on C-; O d that finalizes the task at point. It prompts for a finalized keyword from org-done-keywords, so the picker tracks org-todo-keywords automatically. Marking the task done fires the org-roam journal-copy hook, so the completed task lands in today's daily.

Then the heading is reshaped by depth. A sub-task (level 3 or deeper, or a VERIFY at any depth) becomes a dated log entry: the keyword and priority cookie are stripped, a sortable timestamp is prepended, and the tags are kept. A top-level task keeps its keyword and gains a date-only CLOSED line.

The command binds org-inhibit-logging around the org-todo call so it owns the CLOSED line rather than depending on org-log-done, which is set inconsistently across two modules. The journal hook keys off org-state, not org-log-done, so the copy still fires.

Tests run in org temp-buffers with the journal hook bound to nil, exercise the real org primitives, and inject a fixed time so the stamp shape is deterministic.

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