README mission statement glow-up

[msitarzewski]

Summary

• Rewrites README with freedom-first broadcast narrative modeled on oneye's philosophical opening
• Adds Signal UX hero screenshot, GitHub Sponsor badge/links, and "rent free" energy
• Aligns all terminology with Signal UX redesign (Start Broadcast, host/engineer/caller roles)
• Closes with a quiet talk hard.

What changed

• New: 4-paragraph mission narrative (scenario → philosophy → technical manifesto → multiplier)
• New: Hero image from live demo (docs/screenshots/studio.png)
• New: Sponsor badge, nav link, and dedicated section
• Modified: Tagline → "Your voice. Your frequency. No permission required."
• Modified: ASCII diagram labels (Host/Caller), feature bullets (broadcast terminology), Try It steps (Start Broadcast), How It Works description, closing sign-off
• Kept: Badges, Quick Start, comparison table, Architecture link, Development, Contributing, License

Test plan

• Open README on GitHub — hero image renders, markdown formatting correct
• Verify all links work (demo, bug report, sponsor, architecture docs)
• Comparison table data unchanged
• Quick Start commands unchanged
• Read opening paragraphs aloud — feels like oneye's sibling, not a feature sheet

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