Refactor startup paths to use RuntimeConfig (gt-j0546)

Replaced all hardcoded 'claude --dangerously-skip-permissions' invocations
with configurable helpers from internal/config:

- GetRuntimeCommand(rigPath) - simple command string
- GetRuntimeCommandWithPrompt(rigPath, prompt) - with initial prompt
- BuildAgentStartupCommand(role, bdActor, rigPath, prompt) - generic agent
- BuildPolecatStartupCommand(rigName, polecatName, rigPath, prompt) - polecat
- BuildCrewStartupCommand(rigName, crewName, rigPath, prompt) - crew
- BuildStartupCommand(envVars, rigPath, prompt) - custom env vars

Files updated:
- internal/cmd/start.go (4 locations)
- internal/cmd/crew_lifecycle.go (2 locations)
- internal/cmd/crew_at.go (2 locations)
- internal/cmd/deacon.go
- internal/cmd/witness.go
- internal/cmd/up.go (2 locations)
- internal/cmd/handoff.go (2 locations)
- internal/daemon/daemon.go (3 locations)
- internal/daemon/lifecycle.go
- internal/session/manager.go
- internal/refinery/manager.go
- internal/boot/boot.go

This enables future support for alternative LLM runtimes (aider, etc.)
via rig/town settings configuration.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

internal/boot/boot.go

@@ -11,6 +11,7 @@ import (
 	"path/filepath"
 	"time"
 
+	"github.com/steveyegge/gastown/internal/config"
 	"github.com/steveyegge/gastown/internal/tmux"
 )
 
@@ -191,7 +192,7 @@ func (b *Boot) spawnTmux() error {
 
 	// Launch Claude with environment exported inline and initial triage prompt
 	// The "gt boot triage" prompt tells Boot to immediately start triage (GUPP principle)
-	startCmd := `export GT_ROLE=boot BD_ACTOR=deacon-boot && claude --dangerously-skip-permissions "gt boot triage"`
+	startCmd := config.BuildAgentStartupCommand("boot", "deacon-boot", "", "gt boot triage")
 	if err := b.tmux.SendKeys(SessionName, startCmd); err != nil {
 		return fmt.Errorf("sending startup command: %w", err)
 	}