fix: flip symlink structure - AGENTS.md is the real file

AGENTS.md is now the canonical instruction file, with CLAUDE.md,
.cursorrules, and .github/copilot-instructions.md as symlinks to it.

This is simpler and more intuitive - the main file is at the root,
not buried in .github/.

Updated all references across agents, commands, skills, and .memory/.

.config/opencode/AGENTS.md

@@ -34,23 +34,23 @@ Be specific in summaries: include parameter names, defaults, file locations, and
 
 ## Cross-Tool Instruction Files
 
-Use symlinks to share ONE instruction file across all agentic coding tools:
+Use symlinks to share this instruction file across all agentic coding tools:
 
 ```text
 project/
-├── .github/
-│   └── copilot-instructions.md    # Real file (edit this one)
-├── AGENTS.md -> .github/copilot-instructions.md
-├── CLAUDE.md -> .github/copilot-instructions.md
-└── .cursorrules -> .github/copilot-instructions.md
+├── AGENTS.md                          # Real file (edit this one)
+├── CLAUDE.md -> AGENTS.md
+├── .cursorrules -> AGENTS.md
+└── .github/
+    └── copilot-instructions.md -> ../AGENTS.md
 ```
 
 **Rules:**
-- Edit `.github/copilot-instructions.md` — changes propagate automatically via symlinks
+- Edit `AGENTS.md` — changes propagate automatically via symlinks
 - Never edit symlinked files directly (changes would be lost)
 - Symlinks are committed to git (git tracks them natively)
 
-**Content of the instruction file:**
+**Content of this file:**
 - Project overview and purpose
 - Tech stack and architecture
 - Coding conventions and patterns
@@ -60,12 +60,12 @@ project/
 **Do NOT duplicate `.memory/` contents** — instruction files describe how to work with the project, not active plans, research, or decisions.
 
 **When initializing a project:**
-1. Create `.github/copilot-instructions.md` with project basics
-2. Create symlinks: `ln -s .github/copilot-instructions.md AGENTS.md` (etc.)
+1. Create `AGENTS.md` with project basics
+2. Create symlinks: `ln -s AGENTS.md CLAUDE.md`, `ln -s AGENTS.md .cursorrules`, `ln -s ../AGENTS.md .github/copilot-instructions.md`
 3. Commit the real file and symlinks to git
 
 **When joining an existing project:**
-- Read `.github/copilot-instructions.md` (or any of the symlinked files) to understand the project
+- Read `AGENTS.md` (or any of the symlinked files) to understand the project
 - If instruction file is missing, create it and the symlinks
 
 ## Session Continuity