docs(readme): frame vouch as a review-gated llm-wiki

[plind-junior]

link karpathy's llm-wiki idea file as the destination vouch is built toward, and state the differentiator in one place: the llm drafts the wiki, but citations are machine-verified and every page passes the review gate.

also tighten the demo-video paragraph around the five-step pipeline (capture, summarize, approve, compile, recall) and note the film ends on real recall output.

What changed

Why

What might break

VEP

Tests

• make check passes locally (lint + mypy + pytest)
• New / changed behaviour has a test
• CHANGELOG.md updated under ## [Unreleased]

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