fix: improve prompts, error messages, and workspace concurrency

- Externalize coordinator, notification, and planning prompts to separate files
- Add workspace mutex for concurrent file operations
- Improve error messages across file_tools, issue_tools, and pr_tools
- Add logging to tool modules for better debugging
- Update tests to match new error message strings

tests/test_issue_tools.py

@@ -56,7 +56,8 @@ def test_close_issue_failure() -> None:
 
     issue_tools: IssueTools = IssueTools(mock_client)
     res: str = issue_tools.close_issue("owner", "repo", 1)
-    assert "Error closing issue: API Error" in res
+    assert "Could not close issue" in res
+    assert "owner/repo" in res
 
 
 def test_get_issue_comments_success() -> None:
@@ -77,7 +78,8 @@ def test_get_issue_comments_failure() -> None:
 
     issue_tools: IssueTools = IssueTools(mock_client)
     res: str = issue_tools.get_issue_comments("owner", "repo", 1)
-    assert "Error getting issue comments: API Error" in res
+    assert "Could not retrieve comments" in res
+    assert "owner/repo" in res
 
 
 def test_list_assigned_issues_success() -> None:
@@ -120,7 +122,7 @@ def test_list_issues_empty() -> None:
 
     issue_tools: IssueTools = IssueTools(mock_client)
     res: str = issue_tools.list_issues("owner", "repo")
-    assert res == "No issues in owner/repo."
+    assert res == "No open issues in owner/repo."
 
 
 def test_list_issues_failure() -> None:
@@ -129,7 +131,8 @@ def test_list_issues_failure() -> None:
 
     issue_tools: IssueTools = IssueTools(mock_client)
     res: str = issue_tools.list_issues("owner", "repo")
-    assert "Error listing issues: API Error" in res
+    assert "Could not list issues" in res
+    assert "owner/repo" in res
 
 
 def test_create_issue_success() -> None:
@@ -153,7 +156,8 @@ def test_create_issue_failure() -> None:
 
     issue_tools: IssueTools = IssueTools(mock_client)
     res: str = issue_tools.create_issue("owner", "repo", "Title", "Body")
-    assert "Error creating issue: API Error" in res
+    assert "Could not create issue" in res
+    assert "Title" in res
 
 
 def test_add_label_to_issue_success() -> None:
@@ -171,7 +175,8 @@ def test_add_label_to_issue_failure() -> None:
 
     issue_tools: IssueTools = IssueTools(mock_client)
     res: str = issue_tools.add_label_to_issue("owner", "repo", 1, "bug")
-    assert "Error adding label to issue #1: API Error" in res
+    assert "Could not add label" in res
+    assert "bug" in res
 
 
 def test_add_comment_to_issue_success() -> None:
@@ -189,4 +194,5 @@ def test_add_comment_to_issue_failure() -> None:
 
     issue_tools: IssueTools = IssueTools(mock_client)
     res: str = issue_tools.add_comment_to_issue("owner", "repo", 1, "body")
-    assert "Error adding comment to issue #1: API Error" in res
+    assert "Could not add comment" in res
+    assert "owner/repo" in res