feat(agent): add instructions field for agent persona/identity

Add an `instructions` text field to the agent model, allowing users to
define each agent's role, expertise, and working style. Instructions are
injected into CLAUDE.md as an "Agent Identity" section so the agent
knows who it is on every task execution.

- Migration 021: add instructions column to agent table
- Backend: create/update/get agent handlers support instructions
- ClaimTask response includes instructions for daemon injection
- execenv: inject instructions into CLAUDE.md meta-skill
- Frontend: add Instructions tab to agent detail panel

server/internal/daemon/execenv/runtime_config.go

@@ -34,6 +34,13 @@ func buildMetaSkillContent(provider string, ctx TaskContextForEnv) string {
 	b.WriteString("# Multica Agent Runtime\n\n")
 	b.WriteString("You are a coding agent in the Multica platform. Use the `multica` CLI to interact with the platform.\n\n")
 
+	// Inject agent identity instructions before workflow commands.
+	if ctx.AgentInstructions != "" {
+		b.WriteString("## Agent Identity\n\n")
+		b.WriteString(ctx.AgentInstructions)
+		b.WriteString("\n\n")
+	}
+
 	b.WriteString("## Available Commands\n\n")
 	b.WriteString("### Read\n")
 	b.WriteString("- `multica issue get <id>` — Get full issue details (title, description, status, priority, assignee)\n")