perf(wave1): reduce Config caps, reorder Client/Monitor for cache

Wave 1 changes:
- Reduce CFG_MAX_KEYBINDS 256→128, CFG_MAX_STRLEN 256→64, CFG_MAX_ARGS 16→8
  → saves ~2.5 MB BSS from Config struct
- Add truncation warnings to config_load when keybind/button/scroll limit reached
- Reorder Client struct: HOT fields (type, mon, tags, floating flags, geom) in first
  cache line, COLD fields (wl_listeners) at end — saves cache misses in arrange()
- Reorder LayerSurface struct similarly
- Split Monitor into Monitor/MonitorCold: hot fields (~120B) stay inline, cold layout
  state lazily allocated on first dwindle/master use
- All cold-field accesses through m->cold-> indirection
- cleanupmon frees m->cold
- Zero-warning build with clang -Werror -Wpedantic

peachmsg/peachwm-ipc-unstable-v2-protocol.c

@@ -0,0 +1,94 @@
+/* Generated by wayland-scanner 1.25.0 */
+
+/*
+ * Copyright (C) 2022 Russell Newcomb
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stdbool.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include "wayland-util.h"
+
+#ifndef __has_attribute
+# define __has_attribute(x) 0  /* Compatibility with non-clang compilers. */
+#endif
+
+#if (__has_attribute(visibility) || defined(__GNUC__) && __GNUC__ >= 4)
+#define WL_PRIVATE __attribute__ ((visibility("hidden")))
+#else
+#define WL_PRIVATE
+#endif
+
+extern const struct wl_interface wl_output_interface;
+extern const struct wl_interface zpeachwm_ipc_output_v2_interface;
+
+static const struct wl_interface *peachwm_ipc_unstable_v2_types[] = {
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	&zpeachwm_ipc_output_v2_interface,
+	&wl_output_interface,
+};
+
+static const struct wl_message zpeachwm_ipc_manager_v2_requests[] = {
+	{ "release", "", peachwm_ipc_unstable_v2_types + 0 },
+	{ "get_output", "no", peachwm_ipc_unstable_v2_types + 4 },
+};
+
+static const struct wl_message zpeachwm_ipc_manager_v2_events[] = {
+	{ "tags", "u", peachwm_ipc_unstable_v2_types + 0 },
+	{ "layout", "s", peachwm_ipc_unstable_v2_types + 0 },
+};
+
+WL_PRIVATE const struct wl_interface zpeachwm_ipc_manager_v2_interface = {
+	"zpeachwm_ipc_manager_v2", 2,
+	2, zpeachwm_ipc_manager_v2_requests,
+	2, zpeachwm_ipc_manager_v2_events,
+};
+
+static const struct wl_message zpeachwm_ipc_output_v2_requests[] = {
+	{ "release", "", peachwm_ipc_unstable_v2_types + 0 },
+	{ "set_tags", "uu", peachwm_ipc_unstable_v2_types + 0 },
+	{ "set_client_tags", "uu", peachwm_ipc_unstable_v2_types + 0 },
+	{ "set_layout", "u", peachwm_ipc_unstable_v2_types + 0 },
+};
+
+static const struct wl_message zpeachwm_ipc_output_v2_events[] = {
+	{ "toggle_visibility", "", peachwm_ipc_unstable_v2_types + 0 },
+	{ "active", "u", peachwm_ipc_unstable_v2_types + 0 },
+	{ "tag", "uuuu", peachwm_ipc_unstable_v2_types + 0 },
+	{ "layout", "u", peachwm_ipc_unstable_v2_types + 0 },
+	{ "title", "s", peachwm_ipc_unstable_v2_types + 0 },
+	{ "appid", "s", peachwm_ipc_unstable_v2_types + 0 },
+	{ "layout_symbol", "s", peachwm_ipc_unstable_v2_types + 0 },
+	{ "frame", "", peachwm_ipc_unstable_v2_types + 0 },
+	{ "fullscreen", "2u", peachwm_ipc_unstable_v2_types + 0 },
+	{ "floating", "2u", peachwm_ipc_unstable_v2_types + 0 },
+};
+
+WL_PRIVATE const struct wl_interface zpeachwm_ipc_output_v2_interface = {
+	"zpeachwm_ipc_output_v2", 2,
+	4, zpeachwm_ipc_output_v2_requests,
+	10, zpeachwm_ipc_output_v2_events,
+};
+