diff --git a/.changeset/fn-343-merge-worktree-cleanup.md b/.changeset/fn-343-merge-worktree-cleanup.md
index 2b6d3982fc..d5386b6638 100644
--- a/.changeset/fn-343-merge-worktree-cleanup.md
+++ b/.changeset/fn-343-merge-worktree-cleanup.md
@@ -1,5 +1,5 @@
 ---
-"@fusion/engine": patch
+"@runfusion/fusion": patch
 ---
 
 Classify harmless temporary merge worktree cleanup failures after `git worktree prune`/porcelain inspection while keeping still-registered worktree leaks visible in merger diagnostics.
diff --git a/packages/core/src/types.ts b/packages/core/src/types.ts
index 12bad910f7..125f458a40 100644
--- a/packages/core/src/types.ts
+++ b/packages/core/src/types.ts
@@ -2368,6 +2368,8 @@ export interface Task {
   sourceMessageId?: string;
   sourceParentTaskId?: string;
   sourceMetadata?: Record<string, unknown>;
+  /** Reconstructed task prompt content when available on in-memory execution tasks. */
+  prompt?: string;
   /** Explicitly assigned user ID for task-user linking. Used during review handoff to indicate
    *  which user should review the task. The sentinel value "requesting-user" indicates the
    *  user who created or steered the task. */
diff --git a/packages/engine/src/__tests__/executor-task-done-invariant.test.ts b/packages/engine/src/__tests__/executor-task-done-invariant.test.ts
index 0670657153..9c3d68a9b6 100644
--- a/packages/engine/src/__tests__/executor-task-done-invariant.test.ts
+++ b/packages/engine/src/__tests__/executor-task-done-invariant.test.ts
@@ -191,6 +191,48 @@ Atlas Notes task-board artifacts only:
     expect(store.handoffToReview).not.toHaveBeenCalled();
   });
 
+  it("FN-350 refuses contradictory implementation plus coordination fallback prompts", async () => {
+    const prompt = `# Task: FN-350 - Route Ready Swift Tasks to Executor Owner
+
+## Review Level: 1 (Plan Only)
+
+**Assessment:** This is a coordination/routing task that should not change product source.
+
+## Mission
+Implement the source fix if possible, or record the intentional block if no safe candidate exists. Do not change product source.
+
+## File Scope
+
+- FN-350 task document \`docs\` via \`fn_task_document_write\`
+
+## Steps
+
+### Step 1: Decide
+- [x] Decision recorded.
+`;
+    const { store, tool } = await setup({
+      id: "FN-350",
+      title: "Route Ready Swift Tasks to Executor Owner",
+      description: "Coordination/routing task with task-document evidence only.",
+      prompt,
+      branch: "fusion/fn-350",
+      noCommitsExpected: undefined,
+      steps: [{ name: "Decide", status: "done" as const }],
+    });
+    mockedExecSync.mockImplementation((cmd: string) => {
+      if (cmd.includes("rev-parse --show-toplevel")) return Buffer.from("/repo/.worktrees/swift-falcon\n");
+      if (cmd.includes("rev-parse --abbrev-ref HEAD")) return Buffer.from("fusion/fn-350\n");
+      if (cmd.includes("rev-list --count")) return Buffer.from("0\n");
+      if (cmd.includes("rev-parse HEAD")) return Buffer.from("def456\n");
+      return Buffer.from("");
+    });
+
+    const result = await tool.execute("id", {});
+
+    expect(result.content[0].text).toContain("fn_task_done refused: no_commits");
+    expect(store.moveTask).toHaveBeenCalledWith("FN-350", "todo", { preserveProgress: true });
+  });
+
   it("FN-4114 still refuses source-changing implementation tasks with zero commits and no explicit no-commit contract", async () => {
     const implementationPrompt = `# Task: FN-4114 - Implement source change
 
diff --git a/packages/engine/src/executor.ts b/packages/engine/src/executor.ts
index 1ad795e847..8450ae2bcd 100644
--- a/packages/engine/src/executor.ts
+++ b/packages/engine/src/executor.ts
@@ -257,7 +257,11 @@ function promptLooksCoordinationOnly(prompt: string): boolean {
   const assessment = prompt.match(/^\*\*Assessment:\*\*\s*([^\n]+)/im)?.[1] ?? "";
   const coordinationText = `${titleMatch}\n${mission}\n${assessment}`.toLowerCase();
   const hasCoordinationIntent = /\b(coordination|routing|route|handoff|assign(?:ment)?|owner|triage|select exactly one|record (?:the )?intentional block)\b/.test(coordinationText);
-  const hasImplementationDirective = /\b(implement|fix|add|change|modify|refactor|build|create|delete|remove)\b/.test(mission.toLowerCase()) && !/record (?:the )?intentional block/.test(mission.toLowerCase());
+  const missionLower = mission.toLowerCase()
+    .replace(/do\s+not\s+(?:edit|modify|change)\s+(?:product\s+)?source/g, "")
+    .replace(/should\s+not\s+change\s+(?:product\s+)?source/g, "")
+    .replace(/must\s+not\s+(?:edit|modify|change)\s+(?:product\s+)?(?:source|code)/g, "");
+  const hasImplementationDirective = /\b(implement|fix|add|change|modify|refactor|build|create|delete|remove)\b/.test(missionLower);
   return hasCoordinationIntent && !hasImplementationDirective;
 }
 
@@ -268,13 +272,13 @@ function promptFileScopeIsBoardOnly(prompt: string): boolean {
   const sourcePathPattern = /(?:^|[\s`'"(])(?:packages|src|source|sources|app|apps|lib|libs|components|scripts|docs|\.github|config|test|tests|__tests__)\//m;
   const sourceExtensionPattern = /\.(?:ts|tsx|js|jsx|mjs|cjs|swift|kt|java|py|go|rs|rb|php|cs|cpp|c|h|hpp|json|ya?ml|toml|mdx?|css|scss|html|sql|sh)\b/m;
   if (sourcePathPattern.test(normalized) || sourceExtensionPattern.test(normalized)) return false;
-  const allowedBoardOnlyPattern = /\b(task[- ]?board|board task|task document|task documents|task metadata|task logs|fusion task tools|fn_task_|\.fusion\/tasks|attachments?)\b/;
+  const allowedBoardOnlyPattern = /(?:^|[^\w/])(?:task[- ]?board|board task|task document|task documents|task metadata|task logs|fusion task tools|fn_task_[\w-]*|\.fusion\/tasks|attachments?)(?=$|[^\w/-])/;
   return allowedBoardOnlyPattern.test(normalized);
 }
 
 function getNoCommitEligibilityReason(task: Task): "explicit noCommitsExpected=true" | "prompt-derived coordination-only no-source scope" | null {
   if (task.noCommitsExpected === true) return "explicit noCommitsExpected=true";
-  const rawPrompt = (task as { prompt?: unknown }).prompt;
+  const rawPrompt = task.prompt;
   const prompt = typeof rawPrompt === "string" ? rawPrompt : "";
   if (!prompt.trim()) return null;
   if (