chore: complete v1.0 milestone

Archive v1.0 MVP: 7 phases, 13 plans, 27/27 requirements.

- Archive roadmap to milestones/v1.0-ROADMAP.md
- Archive requirements to milestones/v1.0-REQUIREMENTS.md
- Move milestone audit into milestones/
- Create MILESTONES.md with v1.0 entry
- Evolve PROJECT.md: move shipped requirements to Validated,
  update Context with stack/LOC, log Key Decisions with outcomes
- Collapse ROADMAP.md to one-line milestone summary
- Update STATE.md to shipped status
- Back-fill stale requirements-completed frontmatter on
  02-01, 04-01, 05-01, 06-01 SUMMARY.md files

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

imptune/templates/base.html

@@ -23,7 +23,7 @@
         <li><a href="/packages" {% if request.url.path == "/packages" %}class="active"{% endif %}>Packages</a></li>
       </ul>
     </nav>
-    <main class="main-content container">
+    <main class="main-content">
       {% block content %}{% endblock %}
     </main>
   </div>

imptune/templates/printer_detail.html

@@ -42,7 +42,7 @@
       const text = document.getElementById('uninstall-cmd').innerText;
       navigator.clipboard.writeText(text).then(() => { copiedUninstall = true; setTimeout(() => copiedUninstall = false, 2000) })
       .catch(() => { /* fallback: text is visible for manual copy */ })
-    " x-text="copiedUninstall ? 'Copied!' : 'Uninstall copy'" class="secondary outline"></button>
+    " x-text="copiedUninstall ? 'Copied!' : 'Copy'" class="secondary outline"></button>
   </div>
 
   <h2>Export</h2>