fix(c_lsp): remove the whole-function ASan suppression; assert the resolution it hid

c_lsp_process_file carried __attribute__((no_sanitize("address"))) over the
entire C LSP orchestration, excluding every direct memory access in it from
ASan -- placed for a stack-pointer-to-registry lifetime bug whose witness test
also had its assertion discarded ((void)find_resolved), so nothing could ever
prove the bug gone. Flagged by the memory-diagnostics standards report
(private/C_MEMORY_DIAGNOSTICS_STANDARDS_REPORT.md, priority 2) as the single
highest-value ASan coverage gap in the repository.

This branch's C LSP registry rework resolved the underlying lifetime: with the
suppression removed, the full c_lsp suite passes under ASan+UBSan (760 tests),
including the formerly-failing template field type resolution, whose test now
asserts the resolved call instead of discarding it.

Honest limit: the original bug predates the branch and its fix is the branch's
broad registry rework, not an isolatable commit -- so the revert-proof is
main-vs-branch (main: suppression + discarded assertion; branch: neither),
not a single-change revert-check.

Signed-off-by: Martin Vogel <martin.vogel.tech@gmail.com>

internal/cbm/lsp/c_lsp.c

@@ -5402,7 +5402,7 @@ static void c_process_class(CLSPContext *ctx, TSNode class_node) {
 // Process file: top-level walk
 // ============================================================================
 
-__attribute__((no_sanitize("address"))) void c_lsp_process_file(CLSPContext *ctx, TSNode root) {
+void c_lsp_process_file(CLSPContext *ctx, TSNode root) {
     if (ts_node_is_null(root))
         return;
 

tests/test_c_lsp.c

@@ -7795,11 +7795,13 @@ TEST(clsp_fix2_struct_field_access_pair_second) {
                                    "}\n"
                                    "");
     ASSERT_NOT_NULL(r);
-    /* KNOWN ISSUE: template field type resolution fails under ASan due to
-     * a stack-pointer-to-registry leak bug in c_lsp.c. The Go test passes
-     * because CGo doesn't run ASan/UBSan. See c_lsp_process_file's
-     * no_sanitize("address") attribute. Tracked as a pre-existing C LSP bug. */
-    (void)find_resolved(r, "test", "bar");
+    /* Formerly a KNOWN ISSUE: template field type resolution failed under
+     * ASan due to a stack-pointer-to-registry lifetime bug, hidden by a
+     * whole-function no_sanitize("address") on c_lsp_process_file and a
+     * discarded assertion here. The suppression is removed and the branch's
+     * C LSP registry rework resolved the lifetime; this now asserts the
+     * resolution it always meant to. */
+    ASSERT_GTE(find_resolved(r, "test", "bar"), 0);
     cbm_free_result(r);
     PASS();
 }