R1: Dashboard 500 fix, Phase 2/7 uncommitted changes

- Fix dashboard 500 when deps disconnected — _gather_state() now returns
  full defaults instead of bare {'connected': False}
- Phase 2: FX param schemas aligned with DSP implementations
- Phase 7: Pipeline routing, preset manager improvements
- Factory presets: cleanup and normalization

Fixes dashboard crash on disconnected state (dogfood issue #1)

src/presets/manager.py

@@ -34,6 +34,9 @@ AUTO_SAVE_DELAY_S = 1.0
 FACTORY_PRESET_DIR = Path(__file__).resolve().parent.parent.parent / "presets" / "factory"
 """Location of bundled factory preset JSON files."""
 
+FACTORY_IR_DIR = FACTORY_PRESET_DIR / "irs"
+"""Location of bundled factory cabinet IR .wav files."""
+
 
 # ── Serialisation helpers ───────────────────────────────────────────────────
 
@@ -513,6 +516,41 @@ class PresetManager:
             logger.info("Installed %d factory presets", count)
         return count
 
+    def install_factory_irs(self, overwrite: bool = False) -> int:
+        """Install bundled factory cabinet IR .wav files into the IR directory.
+
+        Copies IR files from ``FACTORY_IR_DIR`` into the IR loader's default
+        directory (``~/.pedal/irs/``). Existing files are skipped unless
+        ``overwrite=True``.
+
+        Args:
+            overwrite: If True, overwrite existing IR files with the same name.
+
+        Returns:
+            Number of factory IR files installed.
+        """
+        if not FACTORY_IR_DIR.is_dir():
+            logger.warning("Factory IR directory not found: %s", FACTORY_IR_DIR)
+            return 0
+
+        from ..dsp.ir_loader import DEFAULT_IR_DIR
+        dest = DEFAULT_IR_DIR
+        dest.mkdir(parents=True, exist_ok=True)
+
+        count = 0
+        for src in sorted(FACTORY_IR_DIR.glob("*.wav")):
+            dst = dest / src.name
+            if dst.exists() and not overwrite:
+                logger.debug("Skipping existing IR: %s", dst.name)
+                continue
+            shutil.copy2(src, dst)
+            count += 1
+            logger.debug("Installed factory IR: %s", dst.name)
+
+        if count:
+            logger.info("Installed %d factory cab IRs into %s", count, dest)
+        return count
+
     # ── Internal helpers ────────────────────────────────────────────────────
 
     def _preset_path(self, bank: int, program: int) -> Path: