chore: ignore tooling caches, scratch screenshots, sister website project

Three categories added to .gitignore:

  Tool caches / runtime state:
    .claude/                — Claude Code session state + lock files
                              (scheduled_tasks.lock untracked here)
    .serena/                — Serena MCP project cache
    ruvector.db             — RuVector AgentDB binary

  Scratch screenshots:
    /*.jpg                  — debug captures dropped at repo root
    /.audit-screenshots/    — UX audit run output (regenerable)

  Sister project:
    /website/               — separate Nuxt marketing site, kept on disk
                              for reference but not tracked in this repo

The single tracked file in .claude/ (scheduled_tasks.lock) is removed
from the index here; future dev sessions won't bring it back.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitignore

@@ -28,9 +28,19 @@ docker-compose.override.yml
 
 # Ad-hoc screenshots / scratch artifacts at repo root
 /*.png
+/*.jpg
 
 # Legacy Nuxt portal — kept on disk for reference, not tracked here
 /client-portal/
 
+# Sister marketing site — separate Nuxt project, not part of CRM tracking
+/website/
+
 # Mobile audit screenshots — generated locally, regenerable
 /.audit/
+/.audit-screenshots/
+
+# Tool caches / runtime state
+/.claude/
+/.serena/
+/ruvector.db