feat(type_aliases): add from_dict to SessionInsights, DiscussionSettings, CustomSlice, MMAUsageStats, ProviderPayload, UIPanelConfig, PathInfo

Required by Phase 10 migrations which call these from_dict methods.
Without these, CustomSlice.from_dict() and MMAUsageStats.from_dict()
used in gui_2.py would raise AttributeError at runtime.

Adds the from_dict pattern consistent with the existing
CommsLogEntry/HistoryMessage/ToolDefinition from_dict:
- Filter dict keys to only the dataclass fields (ignore extras)
- Pass filtered dict to cls(**filtered)

Field definitions unchanged. No-op behavior for callers that
already have a dataclass instance (they pass through isinstance check).

Tests: 51/51 pass across all related test files.

src/type_aliases.py

@@ -85,6 +85,10 @@ class SessionInsights:
  def to_dict(self) -> Metadata:
   return {f.name: getattr(self, f.name) for f in dc_fields(self)}
 
+ @classmethod
+ def from_dict(cls, data: Metadata) -> "SessionInsights":
+  return cls(**{k: v for k, v in data.items() if k in {f.name for f in dc_fields(cls)}})
+
 
 @dataclass(frozen=True)
 class DiscussionSettings:
@@ -95,6 +99,10 @@ class DiscussionSettings:
  def to_dict(self) -> Metadata:
   return {f.name: getattr(self, f.name) for f in dc_fields(self)}
 
+ @classmethod
+ def from_dict(cls, data: Metadata) -> "DiscussionSettings":
+  return cls(**{k: v for k, v in data.items() if k in {f.name for f in dc_fields(cls)}})
+
 
 @dataclass(frozen=True)
 class CustomSlice:
@@ -106,6 +114,10 @@ class CustomSlice:
  def to_dict(self) -> Metadata:
   return {f.name: getattr(self, f.name) for f in dc_fields(self)}
 
+ @classmethod
+ def from_dict(cls, data: Metadata) -> "CustomSlice":
+  return cls(**{k: v for k, v in data.items() if k in {f.name for f in dc_fields(cls)}})
+
 
 @dataclass(frozen=True)
 class MMAUsageStats:
@@ -116,6 +128,10 @@ class MMAUsageStats:
  def to_dict(self) -> Metadata:
   return {f.name: getattr(self, f.name) for f in dc_fields(self)}
 
+ @classmethod
+ def from_dict(cls, data: Metadata) -> "MMAUsageStats":
+  return cls(**{k: v for k, v in data.items() if k in {f.name for f in dc_fields(cls)}})
+
 
 @dataclass(frozen=True)
 class ProviderPayload:
@@ -127,6 +143,10 @@ class ProviderPayload:
  def to_dict(self) -> Metadata:
   return {f.name: getattr(self, f.name) for f in dc_fields(self)}
 
+ @classmethod
+ def from_dict(cls, data: Metadata) -> "ProviderPayload":
+  return cls(**{k: v for k, v in data.items() if k in {f.name for f in dc_fields(cls)}})
+
 
 @dataclass(frozen=True)
 class UIPanelConfig:
@@ -137,6 +157,10 @@ class UIPanelConfig:
  def to_dict(self) -> Metadata:
   return {f.name: getattr(self, f.name) for f in dc_fields(self)}
 
+ @classmethod
+ def from_dict(cls, data: Metadata) -> "UIPanelConfig":
+  return cls(**{k: v for k, v in data.items() if k in {f.name for f in dc_fields(cls)}})
+
 
 @dataclass(frozen=True)
 class PathInfo:
@@ -147,6 +171,10 @@ class PathInfo:
  def to_dict(self) -> Metadata:
   return {f.name: getattr(self, f.name) for f in dc_fields(self)}
 
+ @classmethod
+ def from_dict(cls, data: Metadata) -> "PathInfo":
+  return cls(**{k: v for k, v in data.items() if k in {f.name for f in dc_fields(cls)}})
+
 
 CommsLogCallback: TypeAlias = Callable[[CommsLogEntry], None]