feat(resolvers): add MAKE_PDF_SETUP + makePdfDir host paths

Skill templates can now embed {{MAKE_PDF_SETUP}} to resolve $P to the
make-pdf binary via the same discovery order as $B / $D: env override
(MAKE_PDF_BIN), local skill root, global install, or PATH.

Mirrors the pattern established by generateBrowseSetup() and
generateDesignSetup() in scripts/resolvers/design.ts.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

scripts/resolvers/index.ts

@@ -20,6 +20,7 @@ import { generateReviewArmy } from './review-army';
 import { generateDxFramework } from './dx';
 import { generateGBrainContextLoad, generateGBrainSaveResults } from './gbrain';
 import { generateQuestionPreferenceCheck, generateQuestionLog, generateInlineTuneFeedback } from './question-tuning';
+import { generateMakePdfSetup } from './make-pdf';
 
 export const RESOLVERS: Record<string, ResolverFn> = {
   SLUG_EVAL: generateSlugEval,
@@ -70,4 +71,5 @@ export const RESOLVERS: Record<string, ResolverFn> = {
   QUESTION_PREFERENCE_CHECK: generateQuestionPreferenceCheck,
   QUESTION_LOG: generateQuestionLog,
   INLINE_TUNE_FEEDBACK: generateInlineTuneFeedback,
+  MAKE_PDF_SETUP: generateMakePdfSetup,
 };

scripts/resolvers/make-pdf.ts

@@ -0,0 +1,50 @@
+import type { TemplateContext } from './types';
+
+/**
+ * {{MAKE_PDF_SETUP}} — emits the shell preamble that resolves $P to the
+ * make-pdf binary. Mirrors generateBrowseSetup / generateDesignSetup.
+ *
+ * $P = make-pdf/dist/pdf.
+ *
+ * Resolution order (matches src/browseClient.ts::resolveBrowseBin):
+ *   1. Local skill root: $_ROOT/{localSkillRoot}/make-pdf/dist/pdf
+ *   2. Global: ~/{globalRoot}/make-pdf/dist/pdf
+ *   3. Env override (MAKE_PDF_BIN) — for contributor dev builds
+ */
+export function generateMakePdfSetup(ctx: TemplateContext): string {
+  return `## MAKE-PDF SETUP (run this check BEFORE any make-pdf command)
+
+\`\`\`bash
+_ROOT=$(git rev-parse --show-toplevel 2>/dev/null)
+P=""
+[ -n "$MAKE_PDF_BIN" ] && [ -x "$MAKE_PDF_BIN" ] && P="$MAKE_PDF_BIN"
+[ -z "$P" ] && [ -n "$_ROOT" ] && [ -x "$_ROOT/${ctx.paths.localSkillRoot}/make-pdf/dist/pdf" ] && P="$_ROOT/${ctx.paths.localSkillRoot}/make-pdf/dist/pdf"
+[ -z "$P" ] && P="$HOME${ctx.paths.makePdfDir.replace(/^~/, '')}/pdf"
+if [ -x "$P" ]; then
+  echo "MAKE_PDF_READY: $P"
+  alias _p_="$P"   # shellcheck alias helper (not exported)
+  export P   # available as $P in subsequent blocks within the same skill invocation
+else
+  echo "MAKE_PDF_NOT_AVAILABLE (run './setup' in the gstack repo to build it)"
+fi
+\`\`\`
+
+If \`MAKE_PDF_NOT_AVAILABLE\` is printed: tell the user the binary is not
+built. Have them run \`./setup\` from the gstack repo, then retry.
+
+If \`MAKE_PDF_READY\` is printed: \`$P\` is the binary path for the rest of
+the skill. Use \`$P\` (not an explicit path) so the skill body stays portable.
+
+Core commands:
+- \`$P generate <input.md> [output.pdf]\` — render markdown to PDF (80% use case)
+- \`$P generate --cover --toc essay.md out.pdf\` — full publication layout
+- \`$P generate --watermark DRAFT memo.md draft.pdf\` — diagonal DRAFT watermark
+- \`$P preview <input.md>\` — render HTML and open in browser (fast iteration)
+- \`$P setup\` — verify browse + Chromium + pdftotext and run a smoke test
+- \`$P --help\` — full flag reference
+
+Output contract:
+- \`stdout\`: ONLY the output path on success. One line.
+- \`stderr\`: progress (\`Rendering HTML... Generating PDF...\`) unless \`--quiet\`.
+- Exit 0 success / 1 bad args / 2 render error / 3 Paged.js timeout / 4 browse unavailable.`;
+}

scripts/resolvers/types.ts

@@ -13,6 +13,7 @@ export interface HostPaths {
   binDir: string;
   browseDir: string;
   designDir: string;
+  makePdfDir: string;
 }
 
 /**
@@ -30,6 +31,7 @@ function buildHostPaths(): Record<string, HostPaths> {
         binDir: '$GSTACK_BIN',
         browseDir: '$GSTACK_BROWSE',
         designDir: '$GSTACK_DESIGN',
+        makePdfDir: '$GSTACK_MAKE_PDF',
       };
     } else {
       const root = `~/${config.globalRoot}`;
@@ -39,6 +41,7 @@ function buildHostPaths(): Record<string, HostPaths> {
         binDir: `${root}/bin`,
         browseDir: `${root}/browse/dist`,
         designDir: `${root}/design/dist`,
+        makePdfDir: `${root}/make-pdf/dist`,
       };
     }
   }