Remove CHANGELOG.md and all references

.github/copilot-instructions.md

@@ -48,14 +48,13 @@ Referencing `TASKS.md` PR order:
 ## Copilot Review Priorities
 
 1. **GitHub Staging Files**: Any files in `.github-staging/` directory MUST be manually reviewed before moving to `.github/`. Never automatically move or activate these files. See `.github-staging/README.md` for review process.
-2. **Release Notes**: Verify `CHANGELOG.md` has been updated with a brief description of changes for user-facing or significant technical updates. Skip only for CI plumbing, refactoring, test-only changes, and bot PRs (dependabot, Jules).
-3. Security & Data Integrity: Input validation, single-tenant assumptions honored, issue-machine relationship enforced.
-4. Server-First Compliance: Avoid unnecessary `"use client"`.
-5. Type Safety: No forbidden escapes; proper narrowing.
-6. Progressive Enhancement: `<form action={serverAction}>` patterns validated.
-7. Memory Safety & Test Patterns: Worker-scoped DB setup; no per-test instances.
-8. Domain Consistency: Issue severity vocabulary and one-machine rule.
-9. **E2E Test Quality**: Follow `docs/E2E_BEST_PRACTICES.md` - semantic selectors (role + name), no hard-coded delays, independent tests, descriptive names, reusable actions extracted. Validate critical user journeys only, avoid testing implementation details or edge cases.
+2. Security & Data Integrity: Input validation, single-tenant assumptions honored, issue-machine relationship enforced.
+3. Server-First Compliance: Avoid unnecessary `"use client"`.
+4. Type Safety: No forbidden escapes; proper narrowing.
+5. Progressive Enhancement: `<form action={serverAction}>` patterns validated.
+6. Memory Safety & Test Patterns: Worker-scoped DB setup; no per-test instances.
+7. Domain Consistency: Issue severity vocabulary and one-machine rule.
+8. **E2E Test Quality**: Follow `docs/E2E_BEST_PRACTICES.md` - semantic selectors (role + name), no hard-coded delays, independent tests, descriptive names, reusable actions extracted. Validate critical user journeys only, avoid testing implementation details or edge cases.
 
 ## Preferred Implementation Examples
 

docs/plans/2025-12-27-unconfirmed-users-design.md

@@ -691,4 +691,3 @@ type MachineOwner = {
 
 - `docs/PRODUCT_SPEC.md` - Update to mark MVP+ status
 - `docs/NON_NEGOTIABLES.md` - Add any new patterns/constraints
-- `CHANGELOG.md` - Document this feature when shipped

src/components/layout/Sidebar.tsx

@@ -180,7 +180,7 @@ export function Sidebar({
           )}
         </div>
 
-        {/* Help / Changelog + Collapse (bottom) */}
+        {/* Help + Collapse (bottom) */}
         <div className="border-t border-border px-2 pt-3 pb-2 space-y-2">
           <div className="space-y-1">
             <NavItem