docs(overview): clarify Pi attribution + add Sage usage tip

docs/taskplane-overview/03-agent-quartet.html

@@ -145,7 +145,7 @@ <h1>The agent quartet</h1>
           <li>orch_* tool calls</li>
           <li>failure triage</li>
         </ul>
-        <div class="model-line"><span class="mk">model →</span> <span class="mv">your session model</span></div>
+        <div class="model-line"><span class="mk">model →</span> <span class="mv">your Pi session's model</span></div>
       </div>
 
       <div class="agent worker">

docs/taskplane-overview/17-sage-companion.html

@@ -222,7 +222,7 @@
       </nav>
     </div>
     <h1>Sage — the post-batch quality gate</h1>
-    <p class="subtitle">Sage is a separate pi extension from Taskplane — but the two pair so well I treat them as one workflow. Per-step reviews catch problems inside a task. Sage catches problems <em>across</em> tasks. Every batch I ship gets a Sage pass before I merge.</p>
+    <p class="subtitle">Sage is a separate pi extension from Taskplane (also created by me) — but the two pair so well I treat them as one workflow. Per-step reviews catch problems inside a task. Sage catches problems <em>across</em> tasks. Every batch I ship gets a Sage pass before I merge. (Tip: I use Sage for almost everything I do in pi, not just when I'm using Taskplane.)</p>
 
     <div class="cards">
       <!-- Card 1: What Sage is -->

docs/taskplane-overview/index.html

@@ -125,7 +125,7 @@
       <img class="eyebrow-logo" src="taskplane-word-white.svg" alt="Taskplane">
     </div>
     <h1>Table of Contents</h1>
-    <p class="subtitle">These 17 pages provide an overview of how Taskplane dramatically improves AI agent coding outcomes for long-running multi-task orchestration.</p>
+    <p class="subtitle">These 17 pages provide an overview of how Taskplane with Pi dramatically improves AI agent coding outcomes for long-running multi-task orchestration.</p>
 
     <div class="grid">
       <a class="card c1 start-here" href="01-origin-timeline.html">