zig-p4: pure-Zig ESP32-P4 toolchain

build.zig generates the linker script and drives Zig's own LLD; tools/image.zig
turns the ELF into a flashable image and tools/{rom,serial}.zig speak the mask
ROM loader over the UART. No CMake, ninja, idf.py, esptool, or external linker.

src/soc.zig is a comptime register model over ESP-IDF's own *_reg.h headers;
src/hal/ adds peripheral sequences; src/io/ implements std.Io for the chip;
src/oracle/ diffs this HAL against ESP-IDF's on the die.

1 files changed, 67 insertions, 0 deletions

diff --git a/captures/idf-recheck-chop.json b/captures/idf-recheck-chop.json
new file mode 100644
index 0000000..bbf3eb6
--- /dev/null
+++ b/captures/idf-recheck-chop.json
@@ -0,0 +1,67 @@
+{
+  "tag": "idf-recheck",
+  "mode": "chop",
+  "center_hz": 25000000.0,
+  "rate_hz": 2048000.0,
+  "gain": 19.7,
+  "cmd_on": "T",
+  "cmd_off": "o",
+  "chop_secs": 4.0,
+  "cycles": 4,
+  "guard_s": 0.8,
+  "integration_halfband_hz": 2000.0,
+  "integration_offset_hz": 0.0,
+  "on_segment_db": [
+    6.396,
+    6.67,
+    6.401,
+    6.403
+  ],
+  "off_segment_db": [
+    6.457,
+    6.659,
+    6.523,
+    6.482
+  ],
+  "on_minus_off_db": -0.063,
+  "pooled_sd_db": 0.141,
+  "verdict": "no detection above 3 sd",
+  "marks": [
+    {
+      "t": 242717.41154511,
+      "line": "STATUS p4_mac=80:f1:b2:d3:9a:7f wifi_started=0 ap_up=0 tone_gpio=20 tone_hz=25000000 t=7614532us"
+    },
+    {
+      "t": 242721.321932845,
+      "line": "MARK TONE_CONTINUOUS_ON 25MHz square wave on gpio20 t=11527889us"
+    },
+    {
+      "t": 242725.318133708,
+      "line": "MARK TONE_OFF - t=15527901us"
+    },
+    {
+      "t": 242729.327587696,
+      "line": "MARK TONE_CONTINUOUS_ON 25MHz square wave on gpio20 t=19528418us"
+    },
+    {
+      "t": 242733.319070332,
+      "line": "MARK TONE_OFF - t=23528684us"
+    },
+    {
+      "t": 242737.328479421,
+      "line": "MARK TONE_CONTINUOUS_ON 25MHz square wave on gpio20 t=27529126us"
+    },
+    {
+      "t": 242741.320336123,
+      "line": "MARK TONE_OFF - t=31530804us"
+    },
+    {
+      "t": 242745.329732972,
+      "line": "MARK TONE_CONTINUOUS_ON 25MHz square wave on gpio20 t=35531248us"
+    },
+    {
+      "t": 242749.321956982,
+      "line": "MARK TONE_OFF - t=39531493us"
+    }
+  ]
+}
\ No newline at end of file