feat: cover pi and opencode in link.sh

Generated (concatenated) AGENTS.md for both tools, marked so re-runs
overwrite safely; MACHINE=<name> picks the machine profile. Commands
link into ~/.config/opencode/commands alongside ~/.claude/commands.

bin/link.sh

@@ -7,14 +7,21 @@ set -euo pipefail
 REPO="$(cd "$(dirname "$0")/.." && pwd)"
 
 # targets: agent config skill roots. Claude Code reads ~/.claude/skills,
-# Codex reads ~/.agents/skills. Both consume the same SKILL.md dirs.
+# Codex and Pi read ~/.agents/skills, opencode auto-loads both dirs.
+# All four consume the same SKILL.md dirs.
 CLAUDE_SKILLS="$HOME/.claude/skills"
 CODEX_SKILLS="$HOME/.agents/skills"
 CLAUDE_CMDS="$HOME/.claude/commands"   # commands are Claude-only; Codex ignores
+OPENCODE_CMDS="${XDG_CONFIG_HOME:-$HOME/.config}/opencode/commands"
 CLAUDE_HOOKS="$HOME/.claude/hooks"     # hooks are Claude-only
 CLAUDE_HOME="$HOME/.claude"            # CLAUDE.md fragments, pulled in via @name.md
 CLAUDE_RULES="$HOME/.claude/rules"     # path-scoped rules
 CODEX_HOME="$HOME/.codex"              # Codex global config root
+PI_HOME="$HOME/.pi/agent"              # Pi global config root
+OPENCODE_HOME="${XDG_CONFIG_HOME:-$HOME/.config}/opencode"
+
+# Which claude-md/machines/<name>.md to bake into Pi/opencode AGENTS.md.
+MACHINE="${MACHINE:-default}"
 
 # Per-FILE links, never a whole-dir link: ~/.claude/hooks and ~/.claude itself hold
 # machine-local files this repo does not own, and a dir symlink would hide them.
@@ -34,7 +41,27 @@ link() { # link <src> <dst>
   echo "linked $dst -> $src"
 }
 
-mkdir -p "$CLAUDE_SKILLS" "$CODEX_SKILLS" "$CLAUDE_CMDS" "$CLAUDE_HOOKS" "$CLAUDE_RULES" "$CODEX_HOME"
+gen() { # gen <dst> <fragment...> — writes a generated (concatenated) file
+  local dst="$1"
+  shift
+  if [ -e "$dst" ] && ! grep -q "$GEN_MARK" "$dst" 2>/dev/null; then
+    mkdir -p "$BACKUP"
+    mv "$dst" "$BACKUP/$(basename "$(dirname "$dst")")-$(basename "$dst").bak"
+    echo "backed up existing $dst -> $BACKUP/"
+  fi
+  {
+    echo "$GEN_MARK"
+    for f in "$@"; do
+      echo
+      cat "$f"
+    done
+  } >"$dst"
+  echo "wrote $dst (generated from fragments)"
+}
+
+GEN_MARK="<!-- generated by agent-skills/bin/link.sh — edit fragments, re-run -->"
+
+mkdir -p "$CLAUDE_SKILLS" "$CODEX_SKILLS" "$CLAUDE_CMDS" "$CLAUDE_HOOKS" "$CLAUDE_RULES" "$CODEX_HOME" "$PI_HOME" "$OPENCODE_CMDS"
 
 for d in "$REPO"/skills/*/; do
   name="$(basename "$d")"
@@ -45,6 +72,7 @@ done
 for f in "$REPO"/commands/*.md; do
   [ -e "$f" ] || continue
   link "$f" "$CLAUDE_CMDS/$(basename "$f")"
+  link "$f" "$OPENCODE_CMDS/$(basename "$f")"
 done
 
 for f in "$REPO"/hooks/*.py "$REPO"/hooks/*.sh; do
@@ -54,9 +82,11 @@ done
 
 # code-comments.md is path-scoped and belongs in rules/, not here — linking it
 # into ~/.claude/ as well would load it unconditionally and defeat the scoping.
+# opencode-header.md is opencode-only (baked into its generated AGENTS.md).
 for f in "$REPO"/claude-md/*.md; do
   [ -e "$f" ] || continue
   [ "$(basename "$f")" = "code-comments.md" ] && continue
+  [ "$(basename "$f")" = "opencode-header.md" ] && continue
   link "$f" "$CLAUDE_HOME/$(basename "$f")"
 done
 
@@ -71,6 +101,24 @@ link "$REPO/entry/CLAUDE.md" "$CLAUDE_HOME/CLAUDE.md"
 link "$REPO/entry/codex-AGENTS.md" "$CODEX_HOME/AGENTS.md"
 rm -f "$CODEX_HOME/RTK.md"
 
+# Pi and opencode have no @file imports: their AGENTS.md is generated by
+# concatenating the fragments (machine profile first). opencode auto-loads
+# skills from ~/.claude/skills and ~/.agents/skills, so it needs no skill links.
+gen "$PI_HOME/AGENTS.md" \
+  "$REPO/claude-md/machines/$MACHINE.md" \
+  "$REPO/claude-md/operating.md" \
+  "$REPO/claude-md/writing.md" \
+  "$REPO/claude-md/code-comments.md" \
+  "$REPO/claude-md/RTK.md"
+
+gen "$OPENCODE_HOME/AGENTS.md" \
+  "$REPO/claude-md/opencode-header.md" \
+  "$REPO/claude-md/machines/$MACHINE.md" \
+  "$REPO/claude-md/operating.md" \
+  "$REPO/claude-md/writing.md" \
+  "$REPO/claude-md/code-comments.md" \
+  "$REPO/claude-md/RTK.md"
+
 # Linked but never enabled: enabling on every machine would spawn one review
 # session per box for the same week.
 if [ -d /run/systemd/system ]; then
@@ -81,7 +129,7 @@ if [ -d /run/systemd/system ]; then
   done
 fi
 
-echo "done."
+echo "done. (MACHINE=$MACHINE for generated Pi/opencode AGENTS.md)"
 echo "hooks still need wiring in ~/.claude/settings.json — see hooks/README.md"
 echo "timers (one machine only):"
 echo "  systemctl --user daemon-reload"