agent: remove Go-based systemPrompt composition; priming now via hooks

systemPrompt() loaded and templated files from DefaultPromptsDir() at
startup and on cwd change. This is now handled entirely by the
agentSpawn hook using the prime script, eliminating the parallel
prompt-injection path.

DefaultPromptsDir() is kept for the 9P server's p/ directory exposure.

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

pkg/agent/core.go

@@ -1,7 +1,6 @@
 package agent
 
 import (
-	"bytes"
 	"context"
 	"encoding/json"
 	"errors"
@@ -9,12 +8,10 @@ import (
 	"os"
 	"os/exec"
 	"crypto/rand"
-	"runtime"
 	"strconv"
 	"strings"
 	"sync"
 	"sync/atomic"
-	"text/template"
 	"time"
 
 	"ollie/pkg/backend"
@@ -23,70 +20,12 @@ import (
 	"ollie/pkg/mcp"
 	"ollie/pkg/paths"
 	"ollie/pkg/tools"
-	"path/filepath"
 )
 
 var clog = olog.New("core")
 
 
 
-// systemPrompt assembles the system prompt from ordered *.md parts in DefaultPromptsDir().
-// Files are loaded in lexical order (00_base.md, 01_foo.md, ...) and separated by "---".
-// Each part is rendered as a Go template with session/environment variables.
-func systemPrompt(cwd string) string {
-	if cwd == "" {
-		cwd, _ = os.Getwd()
-	}
-
-	ollieMountPath := os.Getenv("OLLIE")
-	if ollieMountPath == "" {
-		home, _ := os.UserHomeDir()
-		ollieMountPath = home + "/mnt/ollie"
-	}
-
-	data := map[string]string{
-		"CWD":            cwd,
-		"Platform":       runtime.GOOS,
-		"Date":           time.Now().Format("2006-01-02"),
-		"IsGitRepo":      "unknown",
-		"SessionID":      os.Getenv("OLLIE_SESSION_ID"),
-		"OllieMountPath": ollieMountPath,
-	}
-
-	dir := DefaultPromptsDir()
-	entries, err := os.ReadDir(dir)
-	if err != nil {
-		return "You are ollie, an agentic assistant."
-	}
-
-	var buf bytes.Buffer
-	first := true
-	for _, e := range entries {
-		if e.IsDir() || !strings.HasSuffix(e.Name(), ".md") {
-			continue
-		}
-		raw, err := os.ReadFile(filepath.Join(dir, e.Name()))
-		if err != nil {
-			continue
-		}
-		if !first {
-			buf.WriteString("\n\n---\n\n")
-		}
-		tmpl, err := template.New(e.Name()).Parse(string(raw))
-		if err != nil {
-			buf.Write(raw)
-		} else {
-			tmpl.Execute(&buf, data) //nolint:errcheck
-		}
-		first = false
-	}
-
-	if buf.Len() == 0 {
-		return "You are ollie, an agentic assistant."
-	}
-	return buf.String()
-}
-
 // AgentEnv holds the runtime state derived from an agent config file.
 type AgentEnv struct {
 	dispatcher   tools.Dispatcher
@@ -157,10 +96,7 @@ func BuildAgentEnv(cfg *config.Config, d tools.Dispatcher, cwd string) AgentEnv
 		}
 	}
 
-	sp := systemPrompt(cwd)
-	if agentPrompt != "" {
-		sp += "\n\n" + agentPrompt
-	}
+	sp := agentPrompt
 
 	exec := func(ctx context.Context, name string, args json.RawMessage) (string, error) {
 		server, ok := serverOf[name]
@@ -431,12 +367,6 @@ func (s *agentCore) SetCWD(dir string) error {
 			}
 		}
 	}
-	// Rebuild system prompt so it reflects the new cwd.
-	sp := systemPrompt(dir)
-	if s.agentPrompt != "" {
-		sp += "\n\n" + s.agentPrompt
-	}
-	s.loopcfg.systemPrompt = sp
 	return nil
 }
 

pkg/env/env.go

@@ -15,7 +15,6 @@ var managed = []string{
 	"OLLIE",
 	"OLLIE_TOOLS_PATH",
 	"OLLIE_SKILLS_PATH",
-	"OLLIE_PLAN_PATH",
 	"OLLIE_MEMORY_PATH",
 	"OLLIE_TMP_PATH",
 	"OLLIE_TRANSCRIPT_PATH",
@@ -31,7 +30,6 @@ func EnsureDefaults() {
 		"OLLIE":                 filepath.Join(home, "mnt", "ollie"),
 		"OLLIE_TOOLS_PATH":      filepath.Join(home, ".config", "ollie", "tools"),
 		"OLLIE_SKILLS_PATH":     filepath.Join(home, ".config", "ollie", "skills"),
-		"OLLIE_PLAN_PATH":       filepath.Join(home, ".config", "ollie", "planning"),
 		"OLLIE_MEMORY_PATH":     filepath.Join(home, ".config", "ollie", "memory"),
 		"OLLIE_TMP_PATH":        filepath.Join(home, ".local", "share", "ollie", "tmp"),
 		"OLLIE_TRANSCRIPT_PATH": filepath.Join(home, ".config", "ollie", "transcript"),