feat: relationship closing — office-hours adapts to repeat users

The office-hours closing now deepens over time instead of repeating
the same YC plea every session.

Four tiers based on session count:
- Introduction (session 1): full YC plea + founder resources
- Welcome Back (sessions 2-3): lead with recognition, skip plea
- Regular (sessions 4-7): arc-level callbacks, signal visibility,
  builder-to-founder nudge, auto-generated journey summary
- Inner Circle (sessions 8+): the data speaks

Key design decisions (from CEO + Eng + Codex + DX reviews):
- Single source of truth: one builder-profile.jsonl, no split-brain state
- Lead with recognition on repeat visits (DX: magical moment hits immediately)
- Narrative arc journey summary, not data tables
- Tone examples per tier to prevent generic AI voice
- Global resource dedup (low-sensitivity video watch history)
- Migration merges per-project resource logs into builder profile

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

gstack-upgrade/migrations/v0.16.2.0.sh

@@ -0,0 +1,54 @@
+#!/usr/bin/env bash
+# Migration: v0.16.2.0 — Merge per-project resource logs into builder profile
+#
+# What changed: resource dedup moved from per-project resources-shown.jsonl to
+# the global builder-profile.jsonl (single source of truth for all closing state).
+#
+# What this does: finds all per-project resources-shown.jsonl files and merges
+# their URLs into a stub builder-profile entry so existing users don't lose
+# their dedup history. Idempotent — safe to run multiple times.
+#
+# Affected: users who ran /office-hours before this version
+set -euo pipefail
+
+GSTACK_HOME="${GSTACK_HOME:-$HOME/.gstack}"
+PROFILE_FILE="$GSTACK_HOME/builder-profile.jsonl"
+
+# Find all per-project resource logs
+RESOURCE_FILES=$(find "$GSTACK_HOME/projects" -name "resources-shown.jsonl" 2>/dev/null || true)
+
+if [ -z "$RESOURCE_FILES" ]; then
+  # No per-project resource files exist — clean install, nothing to migrate
+  exit 0
+fi
+
+echo "  [v0.16.2.0] Migrating per-project resource logs to builder profile..."
+
+# Collect all unique URLs from all per-project files
+ALL_URLS=$(echo "$RESOURCE_FILES" | while read -r f; do
+  [ -f "$f" ] && cat "$f" 2>/dev/null || true
+done | grep -o '"url":"[^"]*"' | sed 's/"url":"//;s/"//' | sort -u)
+
+if [ -z "$ALL_URLS" ]; then
+  exit 0
+fi
+
+# Check if builder-profile already has resource data (idempotency)
+if [ -f "$PROFILE_FILE" ] && grep -q "resources_shown" "$PROFILE_FILE" 2>/dev/null; then
+  # Already has resource data, check if it includes the migrated URLs
+  EXISTING_URLS=$(grep -o '"resources_shown":\[[^]]*\]' "$PROFILE_FILE" 2>/dev/null | grep -o 'https://[^"]*' | sort -u)
+  NEW_URLS=$(comm -23 <(echo "$ALL_URLS") <(echo "$EXISTING_URLS") 2>/dev/null || echo "$ALL_URLS")
+  if [ -z "$NEW_URLS" ]; then
+    # All URLs already present — nothing to do
+    exit 0
+  fi
+fi
+
+# Build JSON array of URLs
+URL_ARRAY=$(echo "$ALL_URLS" | awk 'BEGIN{printf "["} NR>1{printf ","} {printf "\"%s\"", $0} END{printf "]"}')
+
+# Append a migration stub entry to the builder profile
+mkdir -p "$GSTACK_HOME"
+echo "{\"date\":\"$(date -u +%Y-%m-%dT%H:%M:%SZ)\",\"mode\":\"migration\",\"project_slug\":\"_migrated\",\"signal_count\":0,\"signals\":[],\"design_doc\":\"\",\"assignment\":\"\",\"resources_shown\":$URL_ARRAY,\"topics\":[]}" >> "$PROFILE_FILE"
+
+echo "  [v0.16.2.0] Migrated $(echo "$ALL_URLS" | wc -l | tr -d ' ') resource URLs to builder profile."