Initial import from garrytan/gstack@026751e (main snapshot via local relay)

Source: https://github.com/garrytan/gstack/commit/026751e

scripts/resolvers/preamble/generate-writing-style-migration.ts

@@ -0,0 +1,22 @@
+import type { TemplateContext } from '../types';
+
+export function generateWritingStyleMigration(ctx: TemplateContext): string {
+  return `If \`WRITING_STYLE_PENDING\` is \`yes\`: ask once about writing style:
+
+> v1 prompts are simpler: first-use jargon glosses, outcome-framed questions, shorter prose. Keep default or restore terse?
+
+Options:
+- A) Keep the new default (recommended — good writing helps everyone)
+- B) Restore V0 prose — set \`explain_level: terse\`
+
+If A: leave \`explain_level\` unset (defaults to \`default\`).
+If B: run \`${ctx.paths.binDir}/gstack-config set explain_level terse\`.
+
+Always run (regardless of choice):
+\`\`\`bash
+rm -f ~/.gstack/.writing-style-prompt-pending
+touch ~/.gstack/.writing-style-prompted
+\`\`\`
+
+Skip if \`WRITING_STYLE_PENDING\` is \`no\`.`;
+}