chore: merge origin/main, resolve VERSION + CHANGELOG conflicts

Bump to v0.15.13.0 (above main's 0.15.12.0). Resolve preamble.ts
conflicts (keep both vendoring detection and spawned session check).
Regenerate all SKILL.md files from resolved sources.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

scripts/resolvers/preamble.ts

@@ -97,6 +97,8 @@ if [ -d ".claude/skills/gstack" ] && [ ! -L ".claude/skills/gstack" ]; then
   fi
 fi
 echo "VENDORED_GSTACK: $_VENDORED"
+# Detect spawned session (OpenClaw or other orchestrator)
+[ -n "$OPENCLAW_SESSION" ] && echo "SPAWNED_SESSION: true" || true
 \`\`\``;
 }
 
@@ -268,6 +270,15 @@ touch ~/.gstack/.vendoring-warned-\${SLUG:-unknown}
 This only happens once per project. If the marker file exists, skip entirely.`;
 }
 
+function generateSpawnedSessionCheck(): string {
+  return `If \`SPAWNED_SESSION\` is \`"true"\`, you are running inside a session spawned by an
+AI orchestrator (e.g., OpenClaw). In spawned sessions:
+- Do NOT use AskUserQuestion for interactive prompts. Auto-choose the recommended option.
+- Do NOT run upgrade checks, telemetry prompts, routing injection, or lake intro.
+- Focus on completing the task and reporting results via prose output.
+- End with a completion report: what shipped, decisions made, anything uncertain.`;
+}
+
 function generateAskUserFormat(_ctx: TemplateContext): string {
   return `## AskUserQuestion Format
 
@@ -718,6 +729,7 @@ export function generatePreamble(ctx: TemplateContext): string {
     generateProactivePrompt(ctx),
     generateRoutingInjection(ctx),
     generateVendoringDeprecation(ctx),
+    generateSpawnedSessionCheck(),
     generateVoiceDirective(tier),
     ...(tier >= 2 ? [generateContextRecovery(ctx), generateAskUserFormat(ctx), generateCompletenessSection()] : []),
     ...(tier >= 3 ? [generateRepoModeSection(), generateSearchBeforeBuildingSection(ctx)] : []),