Initial gwin-skill: Gowin ACG525 full toolchain skill for agents.

Co-authored-by: Cursor <cursoragent@cursor.com>

templates/src/top.cst

@@ -0,0 +1,6 @@
+IO_LOC "clk" T9;
+IO_PORT "clk" IO_TYPE=LVCMOS33 PULL_MODE=NONE BANK_VCCIO=3.3;
+IO_LOC "rst_n" H5;
+IO_PORT "rst_n" IO_TYPE=LVCMOS33 PULL_MODE=UP BANK_VCCIO=3.3;
+IO_LOC "led0" C1;
+IO_PORT "led0" IO_TYPE=LVCMOS33 PULL_MODE=NONE DRIVE=8 BANK_VCCIO=3.3;

templates/src/top.sdc

@@ -0,0 +1 @@
+create_clock -name clk -period 20.000 -waveform {0.000 10.000} [get_ports {clk}]

templates/src/top.v

@@ -0,0 +1,18 @@
+// Minimal ACG525 blink template — LED0 on C1, clk T9, rst_n H5
+module top (
+    input  wire clk,
+    input  wire rst_n,
+    output wire led0
+);
+
+    reg [24:0] cnt;
+    always @(posedge clk or negedge rst_n) begin
+        if (!rst_n)
+            cnt <= 25'd0;
+        else
+            cnt <= cnt + 1'b1;
+    end
+
+    assign led0 = cnt[24];
+
+endmodule