…and legal language fixes

Complete rewrite of the Settlement Protocol documentation section:
- Add Relay Chain documentation (Chain ID 537713, Sovereign Stack, Celestia DA)
- Add Allocator component docs (MPC chain signatures, Payload Builders)
- Restructure from flat component pages to narrative-driven architecture
- Add comprehensive flow walkthroughs (Execution, Settlement, Withdrawal, Revert)
- Add 8 inline Mermaid sequence diagrams with interactive zoom/pan
- Add Design Principles and Security & Audits pages
- Add solver and app integration guides
- Consolidate contract references and addresses
- Separate Vaults as distinct protocol section
- Apply legal language fixes (crosschain, revert, destination, asset terminology)
- Add 13 URL redirects for old pages
- Delete 8 obsolete files

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Visual diagram showing the three chain roles in the protocol (Origin,
Relay Chain, Destination) with components, actors, and cost annotations.
Uses inline HTML/CSS for full visual control with brand purple styling,
dark mode support, and responsive mobile layout.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

- Move Relay Chain into Components group, add Security Council and MPC Signing pages
- Consolidate MPC content back into Allocator page
- Create Contracts sidebar group (Addresses, EVM/SVM Depository Reference)
- Rewrite Overview with 5 key dimensions (Speed, Cost, Capital Efficiency, Coverage, UX)
- Restructure How It Works into Architecture + Flows sections with Mermaid diagrams
- Add settlement flow image to Overview
- Remove Design page, absorb relevant content into Overview
- Update solver guide for direct protocol integration (not API)
- Expand Addresses page with Relay Chain and Aurora contract placeholders
- Update Security page to link to Security Council component
- Clean up cross-references and internal links

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

- Link to Relay Chain instead of "dedicated low-cost settlement hub"
- Remove Info callout, Source Code section, and redundant links from overview
- Tighten Failure UX and Coverage copy
- Clarify Hub and Allocator both live on Relay Chain in how-it-works

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

…awal updates

- Oracle reframed as pull-based: never initiates, only responds to requests
- Settlement flow: solver requests attestation from Oracle, submits to Hub
- Withdrawal flow: solver drives entire flow through Oracle
- Add Refund flow: solver-initiated instant refund on origin, settled like a fill
- Rename Revert flow to Forced Exit: user-initiated after fill window expires
- Add solver abandon concept to shorten forced exit window
- Update Oracle component page: request-response pipeline, five attestation types
- Change all "revert" terminology to "refund" in user-facing docs
- Simplify diagrams: merge Oracle validators/contract, remove NEAR MPC participant

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>