Add pathfinder BRIEF mode, resolved-date tracking, and decide-menu-checkpoint cadence (v2.3.0)

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docs/index.html

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       <span class="mark">Opt<br>00</span>
       <h3>Pathfinder<span class="flag">New in 2.0</span></h3>
       <code>/plan2code-0-pathfinder</code>
-      <p>For an idea that arrives too foggy to plan. It charts the idea as a map of decision questions and clears exactly one per session until nothing is left to decide.</p>
+      <p>For an idea that arrives too foggy to plan. It charts the idea as a map of decision questions and clears them one at a time until nothing is left to decide.</p>
       <p class="pen">it never answers its own questions — that's the point</p>
       <ul>
-        <li>One decision per file, one file per session</li>
+        <li>One decision per file, cleared one at a time</li>
+        <li>Ask for a brief — plain-English minutes, any time</li>
         <li>Research questions fan out to parallel agents</li>
         <li>Clears at ≥18/25 on four confidence dimensions</li>
         <li>Hands a hot plan draft to Step 1</li>