feat: enforce hard test-tier requirement across all DevPlace workflow agents and feature-builder docs

Update the feature-builder agent prompt, test-maintainer agent, and all four workflow JS files (devii-tool, endpoint, feature, job-service) to codify the DevPlace test standard as a non-optional project requirement: one test file per endpoint, directory tree mirroring the URL/source path, split into three tiers (unit, api, e2e). Add explicit Test phases to devii-tool, endpoint, feature, and job-service workflows, and embed tier-specific test instructions (path mapping, fixture choice, coverage scope) directly in each workflow's meta description and TESTS constant.

devplacepy/static/css/landing.css

@@ -399,20 +399,20 @@
     }
 }
 
-.landing-bots-intro {
+.landing-help-intro {
     max-width: 760px;
     margin: 0 0 1.5rem;
     color: var(--text-secondary);
     line-height: 1.6;
 }
 
-.landing-bots-grid {
+.landing-help-grid {
     display: grid;
     grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
     gap: 1rem;
 }
 
-.landing-bot-card {
+.landing-help-card {
     background: var(--bg-card);
     border: 1px solid var(--border);
     border-radius: var(--radius-xl);
@@ -422,34 +422,87 @@
     gap: 0.5rem;
 }
 
-.landing-bot-card:hover {
+.landing-help-card:hover {
     transform: translateY(-2px);
     box-shadow: var(--shadow-lg);
 }
 
-.landing-bot-card-lead {
+.landing-help-card-lead {
     border-color: var(--accent);
 }
 
-.landing-bot-icon {
+.landing-help-icon {
     font-size: 1.75rem;
 }
 
-.landing-bot-card h3 {
+.landing-help-card h3 {
     margin: 0;
     color: var(--text-primary);
     font-size: 1.05rem;
 }
 
-.landing-bot-card p {
+.landing-help-card p {
     margin: 0;
     color: var(--text-secondary);
     font-size: 0.9rem;
     line-height: 1.5;
 }
 
+.landing-help-link {
+    margin-top: auto;
+    color: var(--accent);
+    font-size: 0.9rem;
+    font-weight: 600;
+    text-decoration: none;
+}
+
+.landing-help-link:hover {
+    text-decoration: underline;
+}
+
+.landing-help-links {
+    display: flex;
+    flex-wrap: wrap;
+    gap: 1rem;
+    margin-top: auto;
+}
+
+.landing-help-links a {
+    color: var(--accent);
+    font-size: 0.9rem;
+    font-weight: 600;
+    text-decoration: none;
+}
+
+.landing-help-links a:hover {
+    text-decoration: underline;
+}
+
+.landing-help-cta {
+    margin-top: auto;
+    align-self: flex-start;
+    background: var(--accent);
+    color: var(--white);
+    border: none;
+    border-radius: var(--radius-lg);
+    padding: 0.6rem 1.1rem;
+    font-size: 0.95rem;
+    font-weight: 600;
+    cursor: pointer;
+    transition: filter 0.15s ease;
+}
+
+.landing-help-cta:hover {
+    filter: brightness(1.08);
+}
+
 @media (max-width: 480px) {
-    .landing-bots-grid {
+    .landing-help-grid {
         grid-template-columns: 1fr;
     }
+
+    .landing-help-cta {
+        width: 100%;
+        text-align: center;
+    }
 }