docs: add RELEASE_CHECKLIST.md tying npm gates to a pre-merge QA flow

[Peaostrel]

Resolves #452

Description

This PR introduces a human-facing release and pre-merge checklist (docs/RELEASE_CHECKLIST.md) to connect our automated CI gates with manual verification flows. This ensures that nothing ships half-verified and makes the quality bar explicit and repeatable for reviewers and contributors.

Changes Made

• Automated Gates: Listed exact commands for build, test, lint, and format:check, including expected passing results based on package.json.
• Manual QA: Added a checklist for dark/light theme parity, responsive checks across breakpoints (360px, 768px, desktop), keyboard-only navigation for core flows, and screen-reader/reduced-motion edge cases.
• Critical Flows Smoke Test: Added step-by-step verification points for wallet connection, network indicator, bond creation, withdrawals, and trust score lookup.
• Cross-linking: Linked relevant existing documentation (TESTING.md, dark-mode.md, keyboard-interactions.md, motion-guidelines.md, focus-patterns.md, and ACCESSIBILITY.md) instead of duplicating them.
• Validation: Verified that the documented commands run correctly and npm run format:check is clean.

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