fix(ai): write plan files to disk and fix Windows path check

Write plan files to disk via fs.writeFileSync so Claude can read them
back later. Normalize backslashes for Windows path detection in the
.claude/plans/ check.

Author: abose

src-node/claude-code-agent.js

@@ -586,27 +586,33 @@ async function _runQuery(requestId, prompt, projectPath, model, signal, locale,
                         async (input) => {
                             console.log("[Phoenix AI] Intercepted Write tool");
                             // Capture plan content when writing to .claude/plans/
-                            // Don't open plan files in editor — shown in plan card UI
+                            // Plan files: capture content for plan card, write to disk
+                            // but don't open in editor
                             const writePath = input.tool_input.file_path || "";
-                            if (writePath.includes("/.claude/plans/")) {
+                            const normalizedPath = writePath.replace(/\\/g, "/");
+                            if (normalizedPath.includes("/.claude/plans/")) {
                                 _lastPlanContent = input.tool_input.content || "";
                                 console.log("[Phoenix AI] Captured plan content:",
                                     _lastPlanContent.length + "ch");
+                                // Write to disk so Claude can read it back later
+                                try {
+                                    const dir = path.dirname(writePath);
+                                    if (!fs.existsSync(dir)) {
+                                        fs.mkdirSync(dir, { recursive: true });
+                                    }
+                                    fs.writeFileSync(writePath, input.tool_input.content || "", "utf8");
+                                } catch (err) {
+                                    console.warn("[Phoenix AI] Failed to write plan file:", err.message);
+                                }
+                                let planReason = "Plan file saved.";
                                 if (_queuedClarification) {
-                                    return {
-                                        hookSpecificOutput: {
-                                            hookEventName: "PreToolUse",
-                                            permissionDecision: "deny",
-                                            permissionDecisionReason:
-                                                "Plan file saved." + CLARIFICATION_HINT
-                                        }
-                                    };
+                                    planReason += CLARIFICATION_HINT;
                                 }
                                 return {
                                     hookSpecificOutput: {
                                         hookEventName: "PreToolUse",
                                         permissionDecision: "deny",
-                                        permissionDecisionReason: "Plan file saved."
+                                        permissionDecisionReason: planReason
                                     }
                                 };
                             }