feat: Add command field to terminal agent templates

[2witstudios]

Summary

• Add command field to agent defs, templates, protocol, engine, CLI, and macOS app so terminal-type agents can specify a shell command to run
• Fix whitespace-only command bug in AgentsHubView (trim before isEmpty check)
• Extract shared substitute_vars helper in Rust template module to deduplicate render/render_command
• Deduplicate agent type string lists into AgentTypes enum in Swift

Test plan

• cargo test -p pu-core — all 28 template tests pass
• Xcode build — verify Swift changes compile
• Create a terminal agent def with command via CLI and verify it spawns correctly
• Create a prompt template with command in macOS app, verify whitespace-only command is treated as nil

🤖 Generated with Claude Code

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⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 3901f895-d2b9-4db5-be3a-9635477c199f

📥 Commits

Reviewing files that changed from the base of the PR and between e008611 and e6930af.

📒 Files selected for processing (21)

• apps/purepoint-macos/purepoint-macos/Models/AgentsHubModels.swift
• apps/purepoint-macos/purepoint-macos/Models/ManifestModel.swift
• apps/purepoint-macos/purepoint-macos/Models/WorkspaceModel.swift
• apps/purepoint-macos/purepoint-macos/Services/DaemonClient.swift
• apps/purepoint-macos/purepoint-macos/State/AgentsHubState.swift
• apps/purepoint-macos/purepoint-macos/State/ProjectState.swift
• apps/purepoint-macos/purepoint-macos/Views/Agents/AgentCreationSheet.swift
• apps/purepoint-macos/purepoint-macos/Views/Agents/AgentsHubView.swift
• apps/purepoint-macos/purepoint-macos/Views/Agents/PromptCreationSheet.swift
• apps/purepoint-macos/purepoint-macosTests/DaemonClientParseTests.swift
• crates/pu-cli/src/commands/agent_def.rs
• crates/pu-cli/src/commands/prompt.rs
• crates/pu-cli/src/commands/spawn.rs
• crates/pu-cli/src/main.rs
• crates/pu-cli/src/output.rs
• crates/pu-core/src/agent_def.rs
• crates/pu-core/src/protocol.rs
• crates/pu-core/src/template.rs
• crates/pu-core/src/types.rs
• crates/pu-engine/src/engine.rs
• crates/pu-engine/src/test_helpers.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch pu/terminal-templates

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