feat: ✨ add ponytail plugin and caveman agents

Install the Ponytail plugin by resolving its version, patching hook imports, and downloading hooks, skills, and commands. Also add the cavecrew subagents for caveman and copy the always-on ruleset to AGENTS.md. Set autoupdate to false in opencode.json for stability.

Author: tmeckel

Dockerfile

@@ -81,6 +81,7 @@ FOE
 ARG OPENCODE_VERSION=latest
 ARG CAVEMAN_VERSION=latest
 ARG AZURE_FOUNDRY_PROVIDER_REF=v0.4.0
+ARG PONYTAIL_VERSION=latest
 ARG ENGRAM_VERSION=latest
 ARG OPENCODE_BUILD_DIR=/usr/local/share/opencode-build
 
@@ -194,10 +195,13 @@ caveman_resolved_version=$(resolve_github_latest_version "JuliusBrussee/caveman"
 echo "CAVEMAN_RESOLVED_REF=${caveman_resolved_version}"
 echo "${caveman_resolved_version}" > /tmp/caveman_version
 
-mkdir -p "${OPENCODE_CONFIG_DIR}/plugins/caveman" "${OPENCODE_CONFIG_DIR}/commands"
+mkdir -p "${OPENCODE_CONFIG_DIR}/plugins/caveman" "${OPENCODE_CONFIG_DIR}/commands" "${OPENCODE_CONFIG_DIR}/agents"
 
 CAVEMAN_RAW_BASE="https://raw.githubusercontent.com/JuliusBrussee/caveman/refs/tags/${caveman_resolved_version}"
 
+# AGENTS.md — always-on caveman ruleset (auto-discovered by opencode)
+curl -fsSL "${CAVEMAN_RAW_BASE}/src/rules/caveman-activate.md" -o "${OPENCODE_CONFIG_DIR}/AGENTS.md" || exit 1
+
 {
   curl -fsSL "${CAVEMAN_RAW_BASE}/src/plugins/opencode/package.json" -o "${OPENCODE_CONFIG_DIR}/plugins/caveman/package.json"
   curl -fsSL "${CAVEMAN_RAW_BASE}/src/plugins/opencode/plugin.js" -o "${OPENCODE_CONFIG_DIR}/plugins/caveman/plugin.js"
@@ -207,6 +211,10 @@ CAVEMAN_RAW_BASE="https://raw.githubusercontent.com/JuliusBrussee/caveman/refs/t
   curl -fsSL "${CAVEMAN_RAW_BASE}/src/plugins/opencode/commands/caveman-review.md" -o "${OPENCODE_CONFIG_DIR}/commands/caveman-review.md"
   curl -fsSL "${CAVEMAN_RAW_BASE}/src/plugins/opencode/commands/caveman-stats.md" -o "${OPENCODE_CONFIG_DIR}/commands/caveman-stats.md"
   curl -fsSL "${CAVEMAN_RAW_BASE}/src/plugins/opencode/commands/caveman-help.md" -o "${OPENCODE_CONFIG_DIR}/commands/caveman-help.md"
+  # cavecrew subagents — strip `tools:` frontmatter (opencode rejects YAML array form)
+  curl -fsSL "${CAVEMAN_RAW_BASE}/agents/cavecrew-investigator.md" | sed '/^tools:/,/^[^ ]/ { /^tools:/d; /^ /d; }' > "${OPENCODE_CONFIG_DIR}/agents/cavecrew-investigator.md"
+  curl -fsSL "${CAVEMAN_RAW_BASE}/agents/cavecrew-builder.md" | sed '/^tools:/,/^[^ ]/ { /^tools:/d; /^ /d; }' > "${OPENCODE_CONFIG_DIR}/agents/cavecrew-builder.md"
+  curl -fsSL "${CAVEMAN_RAW_BASE}/agents/cavecrew-reviewer.md" | sed '/^tools:/,/^[^ ]/ { /^tools:/d; /^ /d; }' > "${OPENCODE_CONFIG_DIR}/agents/cavecrew-reviewer.md"
 } & wait || exit 1
 
 cat > "${OPENCODE_CONFIG_DIR}/commands/caveman-compress.md" <<'EOF'
@@ -222,6 +230,40 @@ Preserve code, URLs, paths, commands, and structure exactly as the skill require
 Overwrite the original file only if the compression succeeds, and keep the `.original.md` backup.
 EOF
 
+###
+# ponytail
+#
+ponytail_resolved_version=$(resolve_github_latest_version "DietrichGebert/ponytail" "${PONYTAIL_VERSION}") || exit 1
+echo "PONYTAIL_RESOLVED_REF=${ponytail_resolved_version}"
+
+PONYTAIL_RAW_BASE="https://raw.githubusercontent.com/DietrichGebert/ponytail/refs/tags/${ponytail_resolved_version}"
+
+mkdir -p "${OPENCODE_CONFIG_DIR}/plugins/ponytail/hooks" \
+  "${OPENCODE_CONFIG_DIR}/plugins/ponytail/skills/ponytail" \
+  "${OPENCODE_CONFIG_DIR}/commands" \
+  "${OPENCODE_CONFIG_DIR}/skills/ponytail-review" \
+  "${OPENCODE_CONFIG_DIR}/skills/ponytail-help"
+
+curl -fsSL "${PONYTAIL_RAW_BASE}/.opencode/plugins/ponytail.mjs" \
+  | sed 's|../../hooks/|./ponytail/hooks/|g' \
+  > "${OPENCODE_CONFIG_DIR}/plugins/ponytail.mjs" \
+  || exit 1
+grep -qF './ponytail/hooks/' "${OPENCODE_CONFIG_DIR}/plugins/ponytail.mjs" \
+  || {
+  echo "[ponytail] FATAL: import patch failed — ../../hooks/ not replaced. Plugin version may have changed."
+  exit 1;
+}
+
+{
+  curl -fsSL "${PONYTAIL_RAW_BASE}/hooks/ponytail-instructions.js" -o "${OPENCODE_CONFIG_DIR}/plugins/ponytail/hooks/ponytail-instructions.js"
+  curl -fsSL "${PONYTAIL_RAW_BASE}/hooks/ponytail-config.js" -o "${OPENCODE_CONFIG_DIR}/plugins/ponytail/hooks/ponytail-config.js"
+  curl -fsSL "${PONYTAIL_RAW_BASE}/skills/ponytail/SKILL.md" -o "${OPENCODE_CONFIG_DIR}/plugins/ponytail/skills/ponytail/SKILL.md"
+  curl -fsSL "${PONYTAIL_RAW_BASE}/.opencode/command/ponytail.md" -o "${OPENCODE_CONFIG_DIR}/commands/ponytail.md"
+  curl -fsSL "${PONYTAIL_RAW_BASE}/.opencode/command/ponytail-review.md" -o "${OPENCODE_CONFIG_DIR}/commands/ponytail-review.md"
+  curl -fsSL "${PONYTAIL_RAW_BASE}/skills/ponytail-review/SKILL.md" -o "${OPENCODE_CONFIG_DIR}/skills/ponytail-review/SKILL.md"
+  curl -fsSL "${PONYTAIL_RAW_BASE}/skills/ponytail-help/SKILL.md" -o "${OPENCODE_CONFIG_DIR}/skills/ponytail-help/SKILL.md"
+} & wait || exit 1
+
 ###
 # cleanup
 rm -rf /root/.bun
@@ -245,6 +287,7 @@ rm -rf "${OPENCODE_BUILD_DIR}"
 cat >"${OPENCODE_CONFIG_DIR}/opencode.json" <<-'EOF'
 {
   "$schema": "https://opencode.ai/config.json",
+  "autoupdate": false,
   "plugin": [
     "file:///usr/local/bun/install/global/node_modules/opencode-gemini-auth",
     "file:///etc/opencode/plugins/caveman"