Full-GTD implements David Allen's complete "Getting Things Done" methodology
for Emacs org-mode, covering all five workflow steps: Capture, Clarify,
Organize, Reflect, and Engage.

Key features:
- Full GTD workflow with single-key inbox processing, optional clarify,
  and hybrid date input (t/T/w/h shortcuts or free-form)
- Natural Planning Model for project planning with forced completion
- Six Horizons of Focus (L3-L6) with hierarchy
  constraints
- Daily and weekly review cycles with horizon columns
- Context-based filtering and delegation tracking
- Standard GTD lists: Projects, Next Actions, Waiting For,
  Someday/Maybe, Reference
- Single-card execution: algorithmic prioritization by
  urgency/horizons/context instead of list browsing

This package aims to implement the complete framework from the
original book, including both horizontal (workflow) and vertical
(horizons) focus management, which existing packages do not fully
cover.