fix(tui): list project first in the root menu; rename 'scaffolded agent code' to 'agent code'

[tejaskash]

Summary

Two small UX tweaks to the interactive TUI:

• Root menu: project is now the first entry (it was last among the screen-backed commands). Menu and --help order follow handler registration order, so createProjectHandler is registered first in src/handlers/index.tsx.
• project create → type step: the second option now reads agent code instead of scaffolded agent code.

Tests that pinned the old ordering/label are updated accordingly. No behavioral changes beyond ordering and the label.

Before / after

Root menu:

❯ harness     manage AgentCore harnesses          ❯ project     manage an AgentCore project
  identity    ...                                   harness     manage AgentCore harnesses
  ...                                               identity    ...
  project     manage an AgentCore project           ...

project create type step:

○ harness (recommended)          ○ harness (recommended)
● scaffolded agent code    →     ● agent code

Verification

• bun test — 2900 pass, 0 fail
• bun run typecheck, bun run lint:check, bun run format:check — clean

[agentcore-devx-automation]

Claude Security Review: no high-confidence findings. (run)

[agentcore-devx-automation]

AgentCore Harness Review

Verdict: Looks good

Small, focused change that:

• Reorders the root TUI menu so project is the first entry (in both supportedTuiCommands and handler registration).
• Renames the "scaffolded agent code" wizard option to "agent code".
• Updates all affected tests (RouterScreen, CliOnlyScreen, root, project create wizard) to match the new order and label.

I checked for stragglers and everything is consistent:

• No remaining references to "scaffolded agent code" anywhere in src/.
• Handler registration order (index.tsx) matches supportedTuiCommands(...) and matches the expected list in root.test.tsx.
• Other menu-related tests (e.g. project.screen.test.tsx) filter by typing, so they're not affected by the reorder.
• The ❯ harness example in src/testing/setup.ts is just an illustrative comment about ANSI styling and doesn't need to change.

Nothing to block on. LGTM.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.04%. Comparing base (da28031) to head (9051572).

Additional details and impacted files

@@            Coverage Diff            @@
##           refactor    #2220   +/-   ##
=========================================
  Coverage     97.04%   97.04%           
=========================================
  Files           544      544           
  Lines         37536    37536           
=========================================
  Hits          36428    36428           
  Misses         1108     1108           

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