fix: hyperguild brain write requires wing/hall, not legacy type/slug (#79)

Removes brain_write legacy domain/type/knowledge-path params (ADR-0012) and migrates the previously-missed cmd/hyperguild CLI caller (hyperguild brain write) from <type> <slug> to <wing> <hall> <slug>, fixing a 100%% regression the first review round caught. Adds TestWrite_CLIPayloadRoundTrips exercising the real Handler.Write over HTTP to pin the wire contract.

Closes #79.

Co-authored-by: Mathias <mthbqv@gmail.com>

ingestion/internal/mcp/handlers.go

@@ -53,14 +53,12 @@ func (s *Server) tools() []map[string]any {
 		},
 		{
 			"name":        "brain_write",
-			"description": "Write a markdown note to the brain. With wing+hall set, routes to brain/wiki/<wing>/<hall>/ with wing/hall/created_at frontmatter; otherwise writes to brain/knowledge/ (legacy).",
-			"inputSchema": schema([]string{"content"}, map[string]any{
+			"description": "Write a markdown note to brain/wiki/<wing>/<hall>/ with wing/hall/created_at frontmatter. Both wing and hall are required.",
+			"inputSchema": schema([]string{"content", "wing", "hall"}, map[string]any{
 				"content":  str("markdown content"),
 				"filename": str("optional filename or slug"),
-				"type":     str("optional frontmatter type (legacy)"),
-				"domain":   str("optional frontmatter domain (legacy)"),
-				"wing":     str("optional topic domain, e.g. jepa-fx"),
-				"hall":     enum("optional memory type (requires wing)", halls...),
+				"wing":     str("topic domain, e.g. jepa-fx"),
+				"hall":     enum("memory type", halls...),
 			}),
 		},
 		{
@@ -227,8 +225,6 @@ func (s *Server) brainQuery(ctx context.Context, args json.RawMessage) (json.Raw
 type brainWriteArgs struct {
 	Content  string `json:"content"`
 	Filename string `json:"filename,omitempty"`
-	Type     string `json:"type,omitempty"`
-	Domain   string `json:"domain,omitempty"`
 	Wing     string `json:"wing,omitempty"`
 	Hall     string `json:"hall,omitempty"`
 }
@@ -254,8 +250,6 @@ func (s *Server) brainWrite(ctx context.Context, args json.RawMessage) (json.Raw
 	ref, err := s.store.Write(ctx, capture.Note{
 		Content:  a.Content,
 		Filename: a.Filename,
-		Type:     a.Type,
-		Domain:   a.Domain,
 		Wing:     a.Wing,
 		Hall:     a.Hall,
 	})