feat(linkedin-studio): brain Stage 1 finish — title/description + pending-diff typed [skip-docs]

Completes the linkedin-studio in-scope Stage 1 (docs/okf-convergence-brief.md):
- serializeProfile + operations.md seed gain the cheap recommended OKF fields
  `title` + `description` (timestamp/resource intentionally omitted — a timestamp
  would break the pure/deterministic serializer; resource is N/A internally).
- renderDiffMd leads the transient pending-diff.md with `type: PendingDiff`, so
  the brain/ bundle passes okf-check even mid-propose.

Verified: 2 new tests (okf-conform + consolidate-cli); full brain suite 134/134
(0 regressions); cross-tool — okr/scripts/okf-check.mjs validates brain/ exit 0
WITH a pending-diff present.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011vmzxpsFpc8q19LaogAWLD

scripts/brain/src/cli.ts

@@ -249,7 +249,7 @@ function runReconcile(_flags: Record<string, string>): void {
 }
 
 function renderDiffMd(diff: ProfileDiff): string {
-  const lines = ["# Pending profile diff", "", "> Operator-gated. Review, then `brain consolidate --apply --diff brain/pending-diff.json --confirm`.", ""];
+  const lines = ["---", "type: PendingDiff", "---", "", "# Pending profile diff", "", "> Operator-gated. Review, then `brain consolidate --apply --diff brain/pending-diff.json --confirm`.", ""];
   const section = (title: string, items: string[]) => {
     lines.push(`## ${title} (${items.length})`, "");
     for (const i of items) lines.push(`- ${i}`);

scripts/brain/src/profile.ts

@@ -46,6 +46,8 @@ export function serializeProfile(doc: ProfileDoc): string {
   const lines: string[] = [
     "---",
     "type: Profile",
+    "title: Profile",
+    "description: Two-layer semantic profile (static and dynamic) - the distilled who-you-are.",
     "---",
     "",
     "# Profile",

scripts/brain/src/scaffold.ts

@@ -54,6 +54,8 @@ okf_version: 0.1
 function operationsSeed(): string {
   return `---
 type: Operations
+title: Operations
+description: Plans, ideas, and the current-direction anchor - the operations centre.
 ---
 # Operations