Summary

• Replaces Core Primitives / Network Systems with topic-based groups in the Specifications tab. Developers navigate by subject (Bridging, Transactions, etc.) instead of by abstraction level, eliminating duplicate sidebar groups.
• Consolidates two Bridging sections into one group with a clear ordering: Standard Bridges → Deposits → Withdrawals → Cross-Domain Messengers → Base-Solana Bridge.
• Dissolves bridging-and-withdrawals.mdx — its accessible intro content was redistributed into the spec pages (deposits.mdx, withdrawals.mdx, bridges.mdx) so each page stands on its own.
• Moves ecosystem bridges route picker from Specifications to Get Started → Quickstart (user-facing, not a spec).
• Updates overview page cards to match the new topic-based groups.
• Updates IA guidelines and content guidelines to reflect the new structure and decision rationale.

Test plan

• Run mintlify dev and verify all Specifications pages render correctly
• Confirm sidebar groups appear in the intended order with no duplicates
• Verify the redirect from bridging-and-withdrawals → withdrawals works
• Check that ecosystem bridges appears under Get Started → Quickstart
• Run /lint and confirm no errors

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