Add explicit LLM concurrency controls

internal/core/config/flags.go

@@ -11,6 +11,8 @@ type CLIOverrides struct {
 	PrimaryBaseURL                *string
 	ValidationBaseURL             *string
 	PrimaryLLMTimeoutSeconds      *int
+	TotalLLMConcurrency           *int
+	ProposalLLMConcurrency        *int
 	PrimaryLLMConcurrency         *int
 	ValidationLLMTimeoutSeconds   *int
 	MaxRetries                    *int
@@ -62,8 +64,24 @@ func (c *Config) ApplyCLIOverrides(overrides CLIOverrides) error {
 	if overrides.PrimaryLLMTimeoutSeconds != nil {
 		c.PrimaryLLM.TimeoutSeconds = *overrides.PrimaryLLMTimeoutSeconds
 	}
-	if overrides.PrimaryLLMConcurrency != nil {
-		c.PrimaryLLM.Concurrency = *overrides.PrimaryLLMConcurrency
+	totalConcurrencySet := false
+	if overrides.TotalLLMConcurrency != nil {
+		c.TotalLLMConcurrency = *overrides.TotalLLMConcurrency
+		totalConcurrencySet = true
+	}
+	// Backward-compatible alias: --llm-concurrency maps to total concurrency
+	// only when --total-llm-concurrency is not set in the same CLI invocation.
+	if overrides.PrimaryLLMConcurrency != nil && !totalConcurrencySet {
+		c.TotalLLMConcurrency = *overrides.PrimaryLLMConcurrency
+		totalConcurrencySet = true
+	}
+	proposalConcurrencySet := false
+	if overrides.ProposalLLMConcurrency != nil {
+		c.ProposalLLMConcurrency = *overrides.ProposalLLMConcurrency
+		proposalConcurrencySet = true
+	}
+	if totalConcurrencySet && !proposalConcurrencySet {
+		c.ProposalLLMConcurrency = c.TotalLLMConcurrency
 	}
 	if overrides.ValidationLLMTimeoutSeconds != nil {
 		value := *overrides.ValidationLLMTimeoutSeconds
@@ -78,7 +96,7 @@ func (c *Config) ApplyCLIOverrides(overrides CLIOverrides) error {
 	}
 	if overrides.ValidationLLMConcurrency != nil {
 		value := *overrides.ValidationLLMConcurrency
-		c.ValidationLLM.Concurrency = &value
+		c.ValidationLLMConcurrency = &value
 	}
 	if overrides.ValidationMaxPromptTokens != nil {
 		c.ValidationMaxPromptTokens = *overrides.ValidationMaxPromptTokens
@@ -124,5 +142,7 @@ func (c *Config) ApplyCLIOverrides(overrides CLIOverrides) error {
 		c.WorkDirRetention = WorkDirRetention(*overrides.WorkDirRetention)
 	}
 
+	c.syncLegacyConcurrencyAliases()
+
 	return c.Validate()
 }