feat: initial seed of domain-specific contrib skills

org-skill-long-horizon.org

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+:PROPERTIES:
+:ID:       0e050a09-7d5d-43c4-8de4-8762fffd3255
+:CREATED:  [2026-03-31 Tue 20:28]
+:EDITED:   [2026-04-07 Tue 13:42]
+:END:
+#+TITLE: SKILL: Long-Horizon Planning Agent (Universal Literate Note)
+#+STARTUP: content
+#+FILETAGS: :planning:meta-cognition:long-horizon:psf:
+
+* Overview
+The *Long-Horizon Planning Agent* manages complex, multi-step tasks that exceed the context window of standard LLMs. It uses an Org-mode *Dynamic Task Tree* to track progress, summarize completed sub-tasks, and prune irrelevant execution branches.
+
+* Phase A: Demand (PRD)
+:PROPERTIES:
+:STATUS: DRAFT
+:END:
+
+** 1. Purpose
+Enable the agent to maintain focus and coherence over tasks spanning 100+ steps (SWE-bench parity).
+
+** 2. User Needs
+- *Hierarchical Planning:* Break large goals into a nested tree of Org headlines.
+- *Context Compression:* Automatically summarize the results of child sub-trees into their parent nodes.
+- *Branch Pruning:* Meta-cognitive review to stop execution of failed or redundant paths.
+- *Self-Correction:* Adjust the plan dynamically based on environmental feedback.
+
+** 3. Success Criteria
+*** TODO Dynamic Task Tree Generation
+*** TODO Context Compression Verification
+*** TODO Branch Pruning Logic Effectiveness
+