Update ROADMAP.md with strategic future tracks

[t81dev]

This change updates the docs/ROADMAP.md to align with the "Future Research Directions" outlined in the TFMBS_Research_Paper.md. The roadmap now features three parallel development tracks:

1. Hardware Sovereignty: Moving from mock drivers to physical FPGA synthesis and eventually ASIC tape-out readiness.
2. Compiler & Ecosystem Integration: Establishing TFMBS as an MLIR dialect to enable transparent model portability.
3. Extreme Scale & Distributed Orchestration: Leveraging RDMA for multi-node scaling to support 100B+ parameter models.

Additionally, the update includes concrete milestones for real-world hardware verification and distributed data-center execution. Duplicate entries for Phase 21 were also removed to improve document clarity.

---

PR created automatically by Jules for task 3324764104092091636 started by @t81dev

[google-labs-jules]

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down.

I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job!

For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with @jules. You can find this option in the Pull Request section of your global Jules UI settings. You can always switch back!

New to Jules? Learn more at jules.google/docs.

---

For security, I will only act on instructions from the user who triggered this task.