chore(openspec): drop 9 superseded proposals + 11 stub archive files

Drop 9 batch proposals that are superseded by the boocode-lift-analysis
(boocontext-audit, conductor upgrades, self-healing/verify-gate skills):
add-3tier-memory, import-llm-evaluator, import-pregel-engine, plugin-platform,
conductor-evolution, code-intelligence-upgrade, dev-workflow, ui-overhaul,
agent-reliability.

Delete 11 stub archive files (49-66B each, 'Status: Shipped. Archived.' only)
that provide zero documentation value over the existing CHANGELOG.md + git tags.

openspec/changes/token-analyzer-ui/specs/nav-button-token-analytics/spec.md

@@ -0,0 +1,45 @@
+## ADDED Requirements
+
+### Requirement: Nav button in sidebar
+
+The sidebar (`ProjectSidebar.tsx`) SHALL include a "Token Analytics" button in the bottom-pinned section, positioned above the existing Settings button.
+
+#### Scenario: Button renders above Settings
+
+- **WHEN** the sidebar renders
+- **THEN** a "Token Analytics" button is visible in the bottom-pinned div
+- **AND** it is positioned above the "Settings" button
+
+#### Scenario: Button navigates to /analytics
+
+- **WHEN** the user clicks "Token Analytics"
+- **THEN** the app navigates to `/analytics`
+- **AND** the sidebar drawer closes on mobile
+
+### Requirement: Button icon
+
+The nav button SHALL use a visible icon alongside its label.
+
+#### Scenario: Icon renders
+
+- **WHEN** the sidebar renders
+- **THEN** the "Token Analytics" button displays an icon (use `BarChart3` or similar from lucide-react) and the label "Token Analytics"
+
+### Requirement: Active route highlight
+
+The nav button SHALL use the same active/hover styling as the Settings button.
+
+#### Scenario: Active state
+
+- **WHEN** the user is on the `/analytics` route
+- **THEN** the "Token Analytics" button has the same active background styling as other nav buttons
+
+### Requirement: Mobile responsiveness
+
+The nav button SHALL close the sidebar drawer on mobile after navigation, matching the Settings button behavior.
+
+#### Scenario: Mobile navigation closes drawer
+
+- **WHEN** the user is on mobile (sidebar is a slide-in drawer)
+- **AND** they click "Token Analytics"
+- **THEN** the sidebar drawer closes