Build path becomes a setting plus a page toggle; the followup contract round retires

- serve-question: payload buildPath { value, toggle } renders a footer
  segmented control (comp first / code first) with the trade stated in one
  line; the default comes from settings, a flip binds that session only.
  Code-led rounds treat declared comp paths as flip reserves: wireframes
  render, a flip to comp shimmers the slots and surfaces once through
  --wait as BUILD PATH FLIPPED so the agent starts generating mid-round;
  the flip back is free and a landed comp stays. The ANSWER carries
  buildPath and buildPathFlipped with a session-only directive.
- init Step 5 asks the preference once (only when image generation exists)
  and writes .impeccable/settings.json; context.mjs surfaces the recorded
  default every session; PRODUCT.md standing commitments stay honored as
  the fallback.
- new-work retires the two-card execution-contract round: no round asks a
  workflow preference. followup stays as the generic same-table mechanism.
- e2e: new toggle test (14/14 with the wireframe test).

Written with AI assistance (Claude Code).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

skill/scripts/context.mjs

@@ -1142,6 +1142,7 @@ async function cli() {
     parts.push(buildResolvedContextDirective(ctx, cliOptions, { targetExists }));
     appendDetectorFallback(parts, ctx);
     appendImageGenDirective(parts);
+    appendBuildPathDirective(parts);
     appendAutonomyCounterDirective(parts);
     appendSubagentAuthorizationDirective(parts);
     if (shouldWarnMissingTarget(ctx, targetProvided, targetExists)) {
@@ -1161,6 +1162,7 @@ async function cli() {
   parts.push(buildResolvedContextDirective(ctx, cliOptions, { targetExists }));
   appendDetectorFallback(parts, ctx);
   appendImageGenDirective(parts);
+  appendBuildPathDirective(parts);
   appendAutonomyCounterDirective(parts);
   appendSubagentAuthorizationDirective(parts);
   if (shouldWarnMissingTarget(ctx, targetProvided, targetExists)) {
@@ -1269,6 +1271,19 @@ function automaticHookMode(ctx) {
 }
 
 
+// Build-path preference: a workflow setting (comp-led vs code-led), read
+// here so every session starts knowing it without a file hunt. Absence
+// stays silent; new-work's own default applies, and the decision page
+// toggle can flip the value for a single session.
+function appendBuildPathDirective(parts) {
+  try {
+    const settings = JSON.parse(fs.readFileSync(path.join(process.cwd(), '.impeccable', 'settings.json'), 'utf8'));
+    if (settings.buildPath === 'comp' || settings.buildPath === 'code') {
+      parts.push(`BUILD_PATH_DEFAULT: ${settings.buildPath} (from .impeccable/settings.json). Author direction and surface rounds with this as buildPath.value and toggle: true; a flip on the page binds that session only and is never written back to settings.`);
+    }
+  } catch { /* no settings file */ }
+}
+
 // Image generation availability: harness-native tools always win, but when the
 // environment carries an OpenAI key the API fallback works everywhere. The
 // flag only reports capability, positively: absence stays silent, because a