feat: polished loop create/edit form (closes #21)

[CKGrafico]

Closes #21.

Summary

Implement the polished loop create/edit form with task selection, inline command editing, smart defaults, copy-on-edit, direct edit navigation, and real-time per-field validation across board and TUI.

Changes

• Shared validation hook (src/hooks/useLoopFormValidation.ts): single \�alidateField/\�alidateAll\ delegating to \parseDuration(), \parseMaxRuns(), \�uildLoopOptions()\ — both board and TUI consume it
• **Board \CreateForm.tsx**: two-column grid, per-field inline errors, field-level validation on change + submit, task mode toggle (inline/existing) with field reset, copy-to-clipboard for command/cwd, smart CWD default (\process.cwd()), direct edit navigation (bypasses DetailView)
• **TUI \WizardForm.tsx**: per-step validation via shared hook, errors on blur/move/submit, task mode toggle with field clearing, Ctrl+Y copy-to-clipboard
• **TUI \CreateForm.tsx**: command args merged/re-parsed via \parseCommandLine(), CWD pre-filled
• **Removed \DetailView.tsx**: edit action now routes directly to CreateForm in edit mode
• Docs: added guard warning in AGENTS.md + README.md that ttyd is opt-in only (agents must not use it unless explicitly asked)

Verification

• \ sc --noEmit\ passes with zero errors
• \pnpm lint\ shows 87 pre-existing errors (identical to main baseline — zero new)
• \pnpm test\ shows only pre-existing failures (loop-config 2, client-commands 2, daemon-server 29 EACCES permission, loop-controller 2 — all match main)

Issue Reference

Closes #21