feat: straddle support in recorder

Add a straddle from any non-blind seat (default 2×BB) via a preflop control.
Recorded as a preflop post (fits the contract — order carries 'acts last'), tagged
straddle for the log label + removability; the UI-only flag is dropped from the
emitted structured hand. Blinds stay non-removable. Documented in HAND_HISTORY.md.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/HAND_HISTORY.md

@@ -53,6 +53,9 @@ DB, no shared UI components. If RTO is down, Lyra skips analysis and nothing bre
 - **Positions:** `UTG UTG1 UTG2 MP LJ HJ CO BTN SB BB`.
 - **Actions:** `post fold check call bet raise allin`. `amount` is a plain number (no `$`),
   null for non-sized actions (fold/check). Street boards appear as `{street, board}` entries.
+  A **straddle** is recorded as a preflop `post` at a non-blind position (typically 2×BB,
+  voluntary); preflop action starts left of it and it acts last, but that's reflected by
+  action *order*, not a distinct verb.
 - **Streets:** `preflop flop turn river`.
 
 `lyra/poker.py:normalize_structured()` is the single function that guarantees this shape.

lyra/web/static/recorder.js

@@ -239,8 +239,25 @@
              <input class="rec-cards" data-act="board-cards" data-street="${st}" autocapitalize="off" autocomplete="off" spellcheck="false"
                     placeholder="${st === "flop" ? "e.g. 7d 2c 5h" : "e.g. 5h"}" value="${esc(cardsText(s.board[st]))}">
            </label>`;
+
+    // Straddle: a voluntary preflop blind from any non-blind seat, default 2×BB.
+    // Action starts left of it and it acts last preflop — order is whatever you enter.
+    const stradAmt = s.blinds.bb != null ? 2 * s.blinds.bb : null;
+    const stradElig = players.filter((p) => p !== "SB" && p !== "BB" && !s.actions.some((a) => a.straddle && a.pos === p));
+    const straddle =
+      st === "preflop" && stradElig.length
+        ? `<div class="rec-act-add">
+             <select class="rec-sel" data-act="str-pos">
+               <option value="">+ straddle${stradAmt != null ? " (" + stradAmt + ")" : ""}…</option>
+               ${stradElig.map((p) => `<option value="${p}">${p}</option>`).join("")}
+             </select>
+             <button class="rec-add-act" data-act="add-straddle">add</button>
+           </div>`
+        : "";
+
     return `
       ${boardInput}
+      ${straddle}
       <div class="rec-act-add">
         <select class="rec-sel" data-act="na-pos">
           <option value="">who</option>
@@ -255,7 +272,16 @@
       </div>
       <div class="rec-log">
         ${s.board[st] && s.board[st].length && st !== "preflop" ? `<div class="rec-ln brd">${st}: ${cardsText(s.board[st])}</div>` : ""}
-        ${s.actions.filter((a) => a.street === st).map((a, i) => `<div class="rec-ln">${a.pos} <b>${a.action}</b>${a.amount != null ? " " + a.amount : ""}${a.action === "post" ? "" : ` <button class="rec-undo" data-act="rm-action" data-street="${st}" data-i="${i}">✕</button>`}</div>`).join("")}
+        ${s.actions
+          .filter((a) => a.street === st)
+          .map((a, i) => {
+            const label = a.straddle ? "straddle" : a.action;
+            const amt = a.amount != null ? " " + a.amount : "";
+            const fixed = a.action === "post" && !a.straddle; // blinds aren't removable
+            const rm = fixed ? "" : ` <button class="rec-undo" data-act="rm-action" data-street="${st}" data-i="${i}">✕</button>`;
+            return `<div class="rec-ln">${a.pos} <b>${label}</b>${amt}${rm}</div>`;
+          })
+          .join("")}
       </div>`;
   }
 
@@ -297,6 +323,15 @@
       case "add-action":
         addActionFromControls(ctx);
         break;
+      case "add-straddle": {
+        const sel = ctx.container.querySelector('[data-act="str-pos"]');
+        const pos = sel && sel.value;
+        if (pos) {
+          const amt = s.blinds.bb != null ? 2 * s.blinds.bb : null;
+          s.actions.push({ street: "preflop", pos, action: "post", amount: amt, straddle: true });
+        }
+        break;
+      }
       case "rm-action":
         removeAction(s, t.getAttribute("data-street"), parseInt(t.getAttribute("data-i"), 10));
         break;