feat(ultraplan-local): v1.6.0 — /ultraresearch-local deep research command

Add /ultraresearch-local for structured research combining local codebase
analysis with external knowledge via parallel agent swarms. Produces research
briefs with triangulation, confidence ratings, and source quality assessment.

New command: /ultraresearch-local with modes --quick, --local, --external, --fg.
New agents: research-orchestrator (opus), docs-researcher, community-researcher,
security-researcher, contrarian-researcher, gemini-bridge (all sonnet).
New template: research-brief-template.md.

Integration: --research flag in /ultraplan-local accepts pre-built research
briefs (up to 3), enriches the interview and exploration phases. Planning
orchestrator cross-references brief findings during synthesis.

Design principle: Context Engineering — right information to right agent at
right time. Research briefs are structured artifacts in the pipeline:
ultraresearch → brief → ultraplan --research → plan → ultraexecute.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

hooks/scripts/week-rollover.mjs

@@ -0,0 +1,49 @@
+// Pure function for week-rollover logic.
+// Exported separately for testability.
+
+/**
+ * Apply week rollover to state file content.
+ * Returns updated content string if rollover was applied, null otherwise.
+ *
+ * @param {string} stateContent - Full state file content (with YAML frontmatter)
+ * @param {string} currentWeek - Week value from state file (e.g. "2026-W14")
+ * @param {string} actualWeek - Computed current ISO week (e.g. "2026-W15")
+ * @returns {{ content: string, message: string } | null}
+ */
+export function applyWeekRollover(stateContent, currentWeek, actualWeek) {
+  if (!actualWeek) return null;
+
+  // Case 1: current_week is empty — initialize without resetting posts
+  if (!currentWeek) {
+    const updated = stateContent.replace(
+      /^current_week: .*/m,
+      `current_week: "${actualWeek}"`
+    );
+    if (updated === stateContent) return null;
+    return {
+      content: updated,
+      message: `Initialized current_week to ${actualWeek}.`
+    };
+  }
+
+  // Case 2: week matches — no action needed
+  if (currentWeek === actualWeek) return null;
+
+  // Case 3: week changed — reset posts_this_week and update current_week
+  let updated = stateContent;
+  updated = updated.replace(
+    /^posts_this_week: .*/m,
+    'posts_this_week: 0'
+  );
+  updated = updated.replace(
+    /^current_week: .*/m,
+    `current_week: "${actualWeek}"`
+  );
+
+  if (updated === stateContent) return null;
+
+  return {
+    content: updated,
+    message: `Auto-reset: posts_this_week → 0 for new week ${actualWeek} (was ${currentWeek}).`
+  };
+}