feat(review): add code review MCP skill with session history injection

Implements the review skill following the same pattern as retrospective/tdd.
Validates project_root and files args, prepends session history when a
session_id is provided, and delegates to the executor with Read,Bash tools.
Iron-law discipline prompt enforces CRITICAL/WARNING/SUGGESTION output format.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

cmd/supervisor/main.go

@@ -13,6 +13,7 @@ import (
 	"github.com/mathiasbq/supervisor/internal/skills/brain"
 	"github.com/mathiasbq/supervisor/internal/skills/org"
 	"github.com/mathiasbq/supervisor/internal/skills/retrospective"
+	"github.com/mathiasbq/supervisor/internal/skills/review"
 	"github.com/mathiasbq/supervisor/internal/skills/sessionlog"
 	"github.com/mathiasbq/supervisor/internal/skills/tdd"
 	"github.com/mathiasbq/supervisor/internal/tier"
@@ -51,6 +52,12 @@ func main() {
 		os.Exit(1)
 	}
 
+	reviewPrompt, err := os.ReadFile(cfg.ConfigDir + "/review.md")
+	if err != nil {
+		logger.Error("read review.md", "path", cfg.ConfigDir+"/review.md", "err", err)
+		os.Exit(1)
+	}
+
 	executor := iexec.New(iexec.Config{
 		SystemPrompt:   string(systemPrompt),
 		LiteLLMBaseURL: cfg.LiteLLMBaseURL,
@@ -84,6 +91,12 @@ func main() {
 		SessionsDir:  cfg.SessionsDir,
 		ExecutorFn:   executor.Run,
 	}))
+	reg.Register(review.New(review.Config{
+		SkillPrompt:  string(reviewPrompt),
+		DefaultModel: models.Resolve("review", ""),
+		ExecutorFn:   executor.Run,
+		SessionsDir:  cfg.SessionsDir,
+	}))
 
 	srv := mcp.NewServer(reg)
 	mux := http.NewServeMux()