docs: add demo video to README

[rohitg00]

Summary

• Add demo video (assets/demo.mp4, ~11MB) showing agentmemory in action
• Embedded between banner and nav links using HTML5 video tag

Test plan

• Video plays on GitHub README
• No code changes

Summary by CodeRabbit

• Documentation
  • Added a center-aligned video element to the README documentation.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 6fe5b6f8-d88c-4320-9d2e-d625d0634de5

📥 Commits

Reviewing files that changed from the base of the PR and between 11652fa and 18c8bcb.

⛔ Files ignored due to path filters (1)

• assets/demo.mp4 is excluded by !**/*.mp4

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

A centered video element has been added to README.md positioned before the "Why agentmemory" section. This is a pure documentation modification with no code-level changes or functional impact.

Changes

Cohort / File(s)	Summary
Documentation Update README.md	Added a center-aligned video element before the "Why agentmemory" section.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• docs: rewrite README for v0.3.0 — what, why, and agent support #5 — Modified the "Why agentmemory" section and banner in README, directly adjacent to the area where this PR adds the video element.

Poem

🐰 A video now greets the curious eyes,
Centered with care, a visual surprise!
Before "Why agentmemory" it stands so proud,
Drawing seekers in from the browsing crowd.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch docs/add-demo-video

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