Fix Windows/MinGW build: TLS, strndup, sys/wait.h

- CBM_TLS: use _Thread_local (C11 standard) instead of __declspec(thread)
  which only works on MSVC, not MinGW GCC
- Replace bare strndup() with cbm_strndup() in 6 files (strndup is POSIX,
  not available on Windows)
- Guard sys/wait.h with #ifndef _WIN32 in http_server.c

Author: DeusData

src/foundation/compat.h

@@ -12,11 +12,9 @@
 #include <stdio.h>
 
 /* ── Thread-local storage ─────────────────────────────────────── */
-#ifdef _WIN32
-#define CBM_TLS __declspec(thread)
-#else
+/* _Thread_local is C11 standard — works on GCC, Clang, and MSVC (2019+).
+ * __declspec(thread) is MSVC-only and doesn't work on MinGW GCC. */
 #define CBM_TLS _Thread_local
-#endif
 
 /* ── Sleep ────────────────────────────────────────────────────── */
 #ifdef _WIN32

src/graph_buffer/graph_buffer.c

@@ -12,6 +12,7 @@
 #include "store/store.h"
 #include "sqlite_writer.h"
 #include "foundation/hash_table.h"
+#include "foundation/compat.h"
 #include "foundation/log.h"
 #include "foundation/dyn_array.h"
 
@@ -841,7 +842,7 @@ static char *extract_url_path(const char *props) {
         return NULL;
     }
     // NOLINTNEXTLINE(misc-include-cleaner) — strndup provided by standard header
-    return strndup(key, (size_t)(end - key));
+    return cbm_strndup(key, (size_t)(end - key));
 }
 
 int cbm_gbuf_dump_to_sqlite(cbm_gbuf_t *gb, const char *path) {

src/pipeline/pass_calls.c

@@ -139,7 +139,7 @@ static int build_import_map(cbm_pipeline_ctx_t *ctx, const char *rel_path,
                 const char *end = strchr(start, '"');
                 if (end && end > start) {
                     // NOLINTNEXTLINE(misc-include-cleaner) — strndup provided by standard header
-                    char *key = strndup(start, end - start);
+                    char *key = cbm_strndup(start, end - start);
                     keys[count] = key;
                     vals[count] = target->qualified_name;
                     count++;

src/pipeline/pass_enrichment.c

@@ -11,6 +11,7 @@
 #include "foundation/log.h"
 #include "foundation/hash_table.h"
 #include "foundation/platform.h"
+#include "foundation/compat.h"
 #include "yyjson/yyjson.h"
 
 #include <ctype.h>
@@ -46,15 +47,15 @@ int cbm_split_camel_case(const char *s, char **out, int max_out) {
         if (s[i] >= 'A' && s[i] <= 'Z' && s[i - 1] >= 'a' && s[i - 1] <= 'z') {
             if (count < max_out) {
                 // NOLINTNEXTLINE(misc-include-cleaner) — strndup provided by standard header
-                out[count] = strndup(s + start, i - start);
+                out[count] = cbm_strndup(s + start, i - start);
                 count++;
             }
             start = i;
         }
     }
     /* Emit remaining */
     if (count < max_out) {
-        out[count] = strndup(s + start, len - start);
+        out[count] = cbm_strndup(s + start, len - start);
         count++;
     }
     return count;

src/pipeline/pass_parallel.c

@@ -232,7 +232,7 @@ static int build_import_map(const cbm_gbuf_t *gbuf, const char *project_name, co
             const char *end = strchr(start, '"');
             if (end && end > start) {
                 // NOLINTNEXTLINE(misc-include-cleaner) — strndup provided by standard header
-                keys[count] = strndup(start, end - start);
+                keys[count] = cbm_strndup(start, end - start);
                 vals[count] = target->qualified_name;
                 count++;
             }

src/pipeline/pass_semantic.c

@@ -131,7 +131,7 @@ static int build_import_map(cbm_pipeline_ctx_t *ctx, const char *rel_path,
             const char *end = strchr(start, '"');
             if (end && end > start) {
                 // NOLINTNEXTLINE(misc-include-cleaner) — strndup provided by standard header
-                keys[count] = strndup(start, end - start);
+                keys[count] = cbm_strndup(start, end - start);
                 vals[count] = target->qualified_name;
                 count++;
             }

src/pipeline/pass_usages.c

@@ -147,7 +147,7 @@ static int build_import_map(cbm_pipeline_ctx_t *ctx, const char *rel_path,
                 const char *end = strchr(start, '"');
                 if (end && end > start) {
                     // NOLINTNEXTLINE(misc-include-cleaner) — strndup provided by standard header
-                    keys[count] = strndup(start, end - start);
+                    keys[count] = cbm_strndup(start, end - start);
                     vals[count] = target->qualified_name;
                     count++;
                 }

src/ui/http_server.c

@@ -28,8 +28,10 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#ifndef _WIN32
 #include <unistd.h>
 #include <sys/wait.h>
+#endif
 #ifdef __APPLE__
 #include <mach-o/dyld.h>
 #endif