chore: CHANGELOG v0.50.75 + version badge (#620 test isolation fix) (#621)

Co-authored-by: Hermes Agent <agent@hermes>

CHANGELOG.md

@@ -1,5 +1,10 @@
 # Hermes Web UI -- Changelog
 
+## [v0.50.75] — 2026-04-17
+
+### Fixed
+- **Test isolation: `pytest tests/` was overwriting `~/.hermes/.env` with test placeholder keys** — two unit tests in `test_onboarding_existing_config.py` called `apply_onboarding_setup()` in-process without mocking `_get_active_hermes_home`, so every test run wrote `OPENROUTER_API_KEY=test-key-fresh` (or `test-key-confirm`) to the production `.env`. Also added `HERMES_BASE_HOME` to the test server subprocess env (hard-locks profile resolution inside the server to the isolated temp state dir) and stripped real provider keys from the inherited subprocess environment. (PR #620)
+
 ## [v0.50.71] — 2026-04-16
 
 ### Fixed

static/index.html

@@ -561,7 +561,7 @@
                 <div class="settings-section-title">System</div>
                 <div class="settings-section-meta">Instance version and access controls.</div>
               </div>
-              <span class="settings-version-badge">v0.50.71</span>
+              <span class="settings-version-badge">v0.50.75</span>
             </div>
             <div class="settings-field" style="border-top:1px solid var(--border);padding-top:12px;margin-top:8px">
               <label for="settingsPassword" data-i18n="settings_label_password">Access Password</label>