chore(tui): align TUI copy with the CLI help descriptions

[notgitika]

Follow-up to #2207: ran the same description audit across the TUI by rendering all 163 routes and checking every user-visible string against the same rules.

• added the 16 missing header descriptions (the list screens and project create), each verbatim the CLI description for that command
• resource nouns match the CLI — harness lowercase, AgentCore/Runtime/Gateway/Memory/Target/Rule capitalized; ID/ARN/URL/MCP/API initialisms in table headers and wizard fields
• transient status text starts lowercase and uses a real ellipsis
• key hints use one spelling per action (navigate, open, back, ↑↓/jk)
• HarnessWizard's provider copy now matches the newer project create wizard

Picker steps keep their own wording (choose a Gateway to list Rules for) rather than the terminal command's description, since the step is a picker.

[agentcore-devx-automation]

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

[agentcore-devx-automation]

AgentCore Harness Review

Verdict: Looks good

Pure copy/UX polish PR (plus threading a description prop through HarnessWizard). Changes are internally consistent:

• Proper-noun capitalization normalized (Bedrock, OpenAI, Gemini, LiteLLM, AgentCore, MCP)
• Initialisms uppercased (id → ID, arn → ARN, url → URL) in labels/help text/column headers
• Spinner labels sentence-cased (loading… → Loading…, working… → Working…, creating… → Creating…)
• "..." → "…" and ↑↓/kj → ↑↓/jk normalized
• Key-hint verbs standardized (choose/move → navigate, cancel → back)
• List screens gain description subtitles

All affected tests are updated in lockstep with the copy changes, so the assertion drift risk is handled. No new logic, no I/O paths, no telemetry-worthy behavior — instrumentation isn't needed here.

One thing worth confirming (not a blocker): the intentional asymmetric casing of "Runtime" vs "harness" in shared strings like "a Runtime or harness invoke subcommand is required with --json" and "No deployed Runtimes or harnesses were found...". It's applied consistently across the diff, so I'm assuming this reflects the deliberate style convention (Runtime as a branded product noun, harness as a common noun). If that's not the intent, worth aligning them.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 98.82353% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.04%. Comparing base (da28031) to head (d1ffa30).

Files with missing lines	Patch %	Lines
src/handlers/project/create/screen.tsx	92.30%	1 Missing ⚠️
src/handlers/project/invoke/index.tsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           refactor    #2213   +/-   ##
=========================================
  Coverage     97.04%   97.04%           
=========================================
  Files           544      544           
  Lines         37536    37556   +20     
=========================================
+ Hits          36428    36448   +20     
  Misses         1108     1108           

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[AlexanderRichey]

I thought we were going to do all lowercase? Otherwise all looks good. Approving.

[notgitika]

fixed the spinner labels as well good catch!

[Hweinstock]

aligned with our fellow gen z :)

Thanks for taking the time to address these!

[agentcore-devx-automation]

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

[agentcore-devx-automation]

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

[agentcore-devx-automation]

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