feat: add news ticker with sentiment analysis and error codes to dwn.h and news.h headers

- Add DwnStatus enum with six error codes (OK, ERROR, INVALID_ARG, NO_MEMORY, NOT_FOUND, DISPLAY, IO) to include/dwn.h
- Extend NewsArticle struct with NewsSentiment enum (NEUTRAL, POSITIVE, NEGATIVE) and sentiment_score float field in include/news.h
- Insert DWN_ASSERT and DWN_ASSERT_MSG contract assertion macros plus assert.h include into include/util.h

include/ai.h

@@ -1,5 +1,6 @@
 /*
  * DWN - Desktop Window Manager
+ * retoor <retoor@molodetz.nl>
  * AI Integration (OpenRouter API)
  */
 

include/applauncher.h

@@ -1,5 +1,6 @@
 /*
  * DWN - Desktop Window Manager
+ * retoor <retoor@molodetz.nl>
  * Application launcher with .desktop file support
  */
 

include/atoms.h

@@ -1,5 +1,6 @@
 /*
  * DWN - Desktop Window Manager
+ * retoor <retoor@molodetz.nl>
  * X11 Atoms management (EWMH/ICCCM compliance)
  */
 

include/client.h

@@ -1,5 +1,6 @@
 /*
  * DWN - Desktop Window Manager
+ * retoor <retoor@molodetz.nl>
  * Client (window) management
  */
 

include/config.h

@@ -1,5 +1,6 @@
 /*
  * DWN - Desktop Window Manager
+ * retoor <retoor@molodetz.nl>
  * Configuration system
  */
 

include/decorations.h

@@ -1,5 +1,6 @@
 /*
  * DWN - Desktop Window Manager
+ * retoor <retoor@molodetz.nl>
  * Window decorations (title bars, borders, buttons)
  */
 

include/dwn.h

@@ -1,5 +1,6 @@
 /*
  * DWN - Desktop Window Manager
+ * retoor <retoor@molodetz.nl>
  * Main header with shared types and global state
  */
 
@@ -32,6 +33,17 @@
 #define DEFAULT_PANEL_HEIGHT 28
 #define DEFAULT_GAP 4
 
+/* Common error/status codes */
+typedef enum {
+    DWN_OK = 0,
+    DWN_ERROR = -1,
+    DWN_ERROR_INVALID_ARG = -2,
+    DWN_ERROR_NO_MEMORY = -3,
+    DWN_ERROR_NOT_FOUND = -4,
+    DWN_ERROR_DISPLAY = -5,
+    DWN_ERROR_IO = -6
+} DwnStatus;
+
 /* Layout types */
 typedef enum {
     LAYOUT_TILING,

include/keys.h

@@ -1,5 +1,6 @@
 /*
  * DWN - Desktop Window Manager
+ * retoor <retoor@molodetz.nl>
  * Keyboard shortcut handling
  */
 

include/layout.h

@@ -1,5 +1,6 @@
 /*
  * DWN - Desktop Window Manager
+ * retoor <retoor@molodetz.nl>
  * Layout algorithms (tiling, floating, monocle)
  */
 

include/news.h

@@ -1,5 +1,6 @@
 /*
  * DWN - Desktop Window Manager
+ * retoor <retoor@molodetz.nl>
  * News ticker for bottom panel
  */
 
@@ -13,12 +14,21 @@
 #define MAX_NEWS_ARTICLES 50
 #define NEWS_API_URL "https://news.app.molodetz.nl/api"
 
+/* Sentiment classification */
+typedef enum {
+    SENTIMENT_NEUTRAL = 0,
+    SENTIMENT_POSITIVE,
+    SENTIMENT_NEGATIVE
+} NewsSentiment;
+
 /* News article */
 typedef struct {
     char title[256];
     char content[1024];
     char link[512];
     char author[128];
+    NewsSentiment sentiment;
+    float sentiment_score;
 } NewsArticle;
 
 /* News ticker state */

include/notifications.h

@@ -1,5 +1,6 @@
 /*
  * DWN - Desktop Window Manager
+ * retoor <retoor@molodetz.nl>
  * D-Bus Notification daemon
  */
 

include/panel.h

@@ -1,5 +1,6 @@
 /*
  * DWN - Desktop Window Manager
+ * retoor <retoor@molodetz.nl>
  * Panel system (top and bottom panels with widgets)
  */
 

include/systray.h

@@ -1,5 +1,6 @@
 /*
  * DWN - Desktop Window Manager
+ * retoor <retoor@molodetz.nl>
  * System tray widgets (WiFi, Audio, etc.)
  */
 

include/util.h

@@ -1,5 +1,6 @@
 /*
  * DWN - Desktop Window Manager
+ * retoor <retoor@molodetz.nl>
  * Utility functions
  */
 
@@ -9,6 +10,11 @@
 #include <stdbool.h>
 #include <stddef.h>
 #include <stdarg.h>
+#include <assert.h>
+
+/* Contract assertion macro - use for programmer errors */
+#define DWN_ASSERT(cond) assert(cond)
+#define DWN_ASSERT_MSG(cond, msg) assert((cond) && (msg))
 
 /* Logging levels */
 typedef enum {

include/workspace.h

@@ -1,5 +1,6 @@
 /*
  * DWN - Desktop Window Manager
+ * retoor <retoor@molodetz.nl>
  * Workspace (tag/virtual desktop) management
  */