fix: correct harness path and next steps in create summary

[notgitika]

Summary

Two bugs in the create flow completion screen for harnesses:

1. Wrong path in "Created:" tree: Showed harness/<name>/ but harnesses are created under app/<name>/. Fixed in both buildExitMessage (CLI text output) and CreatedSummary (TUI component).

2. Missing cd instruction: The non-interactive (CLI) completion showed "Next: Run agentcore deploy" without telling the user to cd into the project first, causing "No agentcore project found" when they follow the instruction. Replaced with explicit cd <project> + agentcore instructions, matching the buildExitMessage format.

Changes

• src/cli/tui/screens/create/CreateScreen.tsx — 1 file, +19/-41 lines
  • harness/ → app/ in both buildExitMessage and CreatedSummary
  • Replaced NextSteps component in the non-interactive branch with cd + agentcore instructions
  • Removed unused NextSteps/NextStep imports, getCreateNextSteps function, and path.join import

Test plan

• npm run typecheck passes
• npx eslint on changed file passes (0 errors, 0 warnings)
• Manual: run agentcore create, pick harness, verify "Created:" shows app/<name>/ and completion says cd <project> then agentcore

[agentcore-cli-automation]

Reviewed the changes — LGTM.

The → display fix is consistent with where harnesses are actually created (verified in HarnessPrimitive.ts:213, create.test.ts:219, and command.tsx:116). Both buildExitMessage (used as the TUI exit message in App.tsx's interactive path) and the inline non-interactive cd instructions now correctly guide the user into the project before running agentcore.

One very minor nit (non-blocking): NextCommand, NavigateParams, and the onNavigate prop in CreateScreenProps are now effectively dead (the handler is discarded as _onNavigate, and App.tsx's onNavigate callback that does process.chdir is no longer reachable). If you want a follow-up cleanup, the prop and types could be dropped from CreateScreen and the onNavigate={...} block removed from App.tsx. Not a blocker for this PR.

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	43.36%	9866 / 22752
🔵	Statements	42.64%	10480 / 24576
🔵	Functions	40.39%	1666 / 4124
🔵	Branches	39.96%	6352 / 15895

Generated in workflow #2344 for commit 210a75f by the Vitest Coverage Report Action