UX: --trust-hooks flag doesn't show the full merged hook list

[njbrake]

Describe the issue

When using aoe add --trust-hooks, the interactive hook approval prompt is skipped entirely. However, the hooks that actually execute are the merged result of repo hooks + global/profile hooks. The user has no visibility into what the final merged set of hooks looks like.

To reproduce

1. Configure global hooks in ~/.config/agent-of-empires/config.toml:

   [hooks]
   on_create = ["echo global-hook"]

2. Configure repo hooks in project/.agent-of-empires/config.toml:

   [hooks]
   on_create = ["echo repo-hook"]

3. Run: aoe add ~/project -w feat/test -b -t "test" --trust-hooks

The user sees ✓ Repository hooks trusted and Running on_create hooks... but never sees which hooks are actually executing. The repo hooks replace global hooks per-field (not append), which may be surprising.

Expected behavior

When --trust-hooks is used, print the final merged hook list before execution so the user can see exactly what will run:

Running on_create hooks:
  echo repo-hook
✓ on_create hooks completed

This is a minor UX improvement. Global hooks are user-controlled so this is not a security issue, but transparency helps users debug unexpected hook behavior.

Affects

Both CLI (src/cli/add.rs) and potentially TUI paths. The TUI shows hooks in the trust dialog but doesn't show the merged result after approval.