Implement Task 24 wrapper-first RC validation execution support docs

[RadDad87]

Summary

Implemented Task 24 by adapting RC validation documentation to treat the wrapper .exe path as the primary clean-machine validation flow, while retaining BAT as fallback/support only.

Files changed

• wrapper/README.md
• README.md
• Z3R4H_CLEAN_ENV_CHECKLIST.md
• TASKS.md
• Z3R4H_PROGRESS_SUMMARY.md

What was added

• Wrapper-first RC workflow guidance with explicit stage order:
  • config -> llama-* -> webui-* -> browser-launch
• Wrapper-specific required evidence fields:
  • wrapper command/args
  • wrapper exit code + terminal stage
  • stage-by-stage evidence for llama/webui/browser-launch
  • BAT handoff reason/exit code when fallback is used
• Wrapper-specific blocker categories for consistent triage:
  • config/path failures
  • llama stage failures
  • webui stage failures
  • browser-launch failures
  • wrapper->BAT handoff failures
  • exit-code/stage evidence mismatch
  • wrapper-first clean-machine usability blockers

Scope constraints honored

• Documentation/readiness updates only
• No product/backend behavior changes
• No dependency changes
• No legal/license file modifications
• BAT retained as fallback/support in validation workflow, not primary path

Deferred beyond Task 24

• Wrapper runtime behavior changes
• Product/backend changes
• Embedded UI
• Advanced supervision/restart policy work
• Installer/signing/build automation

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Codex Task