fix(tui): remove global statusline

[filipeforattini]

Summary

• remove the experimental global TUI statusline and its configuration
• remove the statusline plugin API and runtime plumbing
• remove the Redskilled render projection and regenerate SDK types
• reclaim the three TUI rows previously reserved for the statusline

Validation

• complete workspace typecheck: 30 packages passed
• focused TUI config/layout, plugin lifecycle, and Redskilled client tests
• ./packages/sdk/js/script/build.ts

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[filipeforattini]

The failing unit checks are inherited from the current main baseline: PR #84, whose merge commit is this PR base, failed in the same snapshot/prompt session tests. This PR does not modify that subsystem; typecheck, release-contract, and both E2E jobs pass.