fix(cli): clean up project creation UX

[notgitika]

Summary

• lowercase the project create progress and success messages and use the shared checkmark glyph
• remove the redundant --defaults option from project create
• remove generated help subcommands from command groups while preserving --help

Testing

• bun test (2,849 tests)
• bun run typecheck
• bun run lint:check
• bun run format:check
• bun run build

[agentcore-devx-automation]

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

[agentcore-devx-automation]

AgentCore Harness Review

Verdict: Looks good

Focused UX cleanup. I checked:

• --defaults is fully removed from src/handlers/project/create/index.ts and the ignore branch in the dispatch guard is gone; no other handler-side references remain. The regression test in project.test.ts asserts Commander now rejects the flag as unknown, which is the desired breaking behavior.
• c.addHelpCommand(false) in src/router/router.tsx is the right Commander API to suppress the auto-generated help [command] subcommand, and it's covered by a new router test that exercises both a group and a nested group, plus asserts --help still works. Applying it unconditionally to every compiled command is safe — Commander only materializes the help subcommand for commands with children.
• Removing the filter((name) => name !== "help") in project.screen.test.tsx is consistent with the new behavior; the menu now naturally sees only real subcommands.
• The streamed-progress test race is properly fixed with the beforeFirstStep gate so waitForText("Creating DemoApp…") can reliably observe the pre-step spinner before the first yield.
• Text/glyph updates (Creating, ✓ Project created in) are mirrored in every affected test.

No blocking issues. This is a cleanup, so no new telemetry surface is expected.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.08%. Comparing base (c796be3) to head (fa05d3d).

Additional details and impacted files

@@             Coverage Diff              @@
##           refactor    #2195      +/-   ##
============================================
- Coverage     97.08%   97.08%   -0.01%     
============================================
  Files           544      544              
  Lines         37768    37764       -4     
============================================
- Hits          36666    36662       -4     
  Misses         1102     1102              

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[agentcore-devx-automation]

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

[agentcore-devx-automation]

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