feat: relationship closing — office-hours adapts to repeat users (v0.16.2.0) (#937)

* fix: sync package.json version with VERSION file

package.json was 0.15.15.0 while VERSION was 0.15.16.0, causing
gen-skill-docs freshness check test failures.

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

* feat: add builder profile helper for office-hours relationship closing

New bin/gstack-builder-profile reads ~/.gstack/builder-profile.jsonl and
outputs structured summary (tier, signals, resources, topics). Single
source of truth for all closing state — no separate config keys or logs.

Uses bun-based JSONL parsing pattern from gstack-learnings-search.
Graceful fallback to introduction tier if bun unavailable or file missing.

26 unit tests covering tier computation, signal accumulation, cross-project
detection, nudge eligibility, resource dedup, and malformed JSONL handling.

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

* 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>

* chore: bump version and changelog (v0.16.2.0)

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

---------

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

package.json

@@ -1,6 +1,6 @@
 {
   "name": "gstack",
-  "version": "0.15.15.0",
+  "version": "0.16.2.0",
   "description": "Garry's Stack — Claude Code skills + fast headless browser. One repo, one install, entire AI engineering workflow.",
   "license": "MIT",
   "type": "module",