feat: Phase 2 — chat templates, reasoning parser, collapsible TUI, mouse support

- internal/llama/template.go: ChatML/Llama3 template engine with stop tokens
- internal/agent/reasoning.go: parse <think>/<reasoning> tags from LLM output
- companion/promptbuilder.go: output structured BuildResult, add date/time context
- agent/agent.go: wire templates + reasoning split into message loop
- storage: add reasoning TEXT column to messages table + migration
- channel/tui.go: collapsible reasoning (tab toggle), mouse scroll, polished dimmed style
- config: CHAT_TEMPLATE env var (chatml|llama3|none)
- plan.md: mark Phase 2 complete, add themes TODO

internal/companion/engine.go

@@ -45,7 +45,7 @@ func NewEngine(cfg *config.Config, db *storage.DB) *Engine {
 	}
 }
 
-func (e *Engine) BuildPrompt(ctx context.Context, input *PromptInput) (string, error) {
+func (e *Engine) BuildPrompt(ctx context.Context, input *PromptInput) (*BuildResult, error) {
 	e.mu.Lock()
 	defer e.mu.Unlock()
 
@@ -54,7 +54,7 @@ func (e *Engine) BuildPrompt(ctx context.Context, input *PromptInput) (string, e
 	mood := e.mood.Current()
 	observations := e.reflection.RecentObservations(5)
 
-	prompt := e.promptBuilder.Build(&BuildInput{
+	result := e.promptBuilder.Build(&BuildInput{
 		SystemPrompt: e.cfg.SystemPrompt,
 		Traits:       traits,
 		Relationship: rel,
@@ -66,7 +66,7 @@ func (e *Engine) BuildPrompt(ctx context.Context, input *PromptInput) (string, e
 	})
 
 	e.lastContact = time.Now()
-	return prompt, nil
+	return result, nil
 }
 
 func (e *Engine) WriteDiary(ctx context.Context) error {

internal/companion/promptbuilder.go

@@ -3,9 +3,9 @@ package companion
 import (
 	"fmt"
 	"strings"
+	"time"
 
 	"git.db123.ir/db123/divacode/internal/config"
-	"git.db123.ir/db123/divacode/pkg/types"
 )
 
 type PromptBuilder struct {
@@ -16,26 +16,29 @@ func NewPromptBuilder(cfg *config.Config) *PromptBuilder {
 	return &PromptBuilder{cfg: cfg}
 }
 
-func (pb *PromptBuilder) Build(in *BuildInput) string {
+type BuildResult struct {
+	SystemContent string
+}
+
+func (pb *PromptBuilder) Build(in *BuildInput) *BuildResult {
 	var b strings.Builder
 
-	b.WriteString("[System]\n")
+	now := time.Now()
+	b.WriteString(fmt.Sprintf("Current date and time: %s\n", now.Format("2006-01-02 15:04:05 (MST)")))
 	b.WriteString(in.SystemPrompt)
 	b.WriteString("\n\n")
 
-	b.WriteString("### Current Personality\n")
+	b.WriteString("Current Personality:\n")
 	for _, t := range in.Traits {
 		label := string(t.Trait)
 		pct := int(t.Value * 100)
 		b.WriteString(fmt.Sprintf("- %s: %d%%\n", label, pct))
 	}
 
-	b.WriteString("\n### Current Mood\n")
-	b.WriteString(string(in.Mood))
-	b.WriteString("\n")
+	b.WriteString(fmt.Sprintf("\nMood: %s\n", in.Mood))
 
 	if in.Relationship != nil && in.Relationship.Familiarity > 0.1 {
-		b.WriteString(fmt.Sprintf("\n### Relationship Context\n"))
+		b.WriteString("\nRelationship:\n")
 		b.WriteString(fmt.Sprintf("- Familiarity: %d%%\n", int(in.Relationship.Familiarity*100)))
 		b.WriteString(fmt.Sprintf("- Trust: %d%%\n", int(in.Relationship.Trust*100)))
 		if len(in.Relationship.SharedTopics) > 0 {
@@ -44,14 +47,14 @@ func (pb *PromptBuilder) Build(in *BuildInput) string {
 	}
 
 	if len(in.Observations) > 0 {
-		b.WriteString("\n### Recent Observations\n")
+		b.WriteString("\nObservations:\n")
 		for _, o := range in.Observations {
 			b.WriteString(fmt.Sprintf("- %s\n", o.Content))
 		}
 	}
 
 	if len(in.Memories) > 0 {
-		b.WriteString("\n### Relevant Memories\n")
+		b.WriteString("\nMemories:\n")
 		for i, m := range in.Memories {
 			if i >= 5 {
 				break
@@ -60,19 +63,5 @@ func (pb *PromptBuilder) Build(in *BuildInput) string {
 		}
 	}
 
-	b.WriteString("\n### Recent Conversation\n")
-	start := 0
-	if len(in.Messages) > 10 {
-		start = len(in.Messages) - 10
-	}
-	for _, msg := range in.Messages[start:] {
-		prefix := "User"
-		if msg.Role == types.RoleAssistant {
-			prefix = "You"
-		}
-		b.WriteString(fmt.Sprintf("%s: %s\n", prefix, msg.Content))
-	}
-
-	b.WriteString("\nYou:")
-	return b.String()
+	return &BuildResult{SystemContent: b.String()}
 }