fix(docs): update 225 broken internal links after building/ restructure

[garvitkaushik-123]

Summary

• Fixes 225 broken internal links across 86 documentation files
• All links pointed to the old flat building/implementation/, building/integration/, building/understanding/ paths that were reorganized into building/by-layer/L0-L4/, building/concepts/, building/operating/, and building/verification/

What changed

20 stale path prefixes replaced with their current locations:

Old path	New path
building/integration/accounts-and-agents	building/by-layer/L2/accounts-and-agents
building/implementation/security	building/by-layer/L1/security
building/compliance-catalog	building/verification/compliance-catalog
building/understanding/security-model	building/concepts/security-model
building/implementation/error-handling	building/by-layer/L3/error-handling
building/implementation/task-lifecycle	building/by-layer/L3/task-lifecycle
building/implementation/webhooks	building/by-layer/L3/webhooks
building/integration/account-state	building/by-layer/L2/account-state
building/validate-your-agent	building/verification/validate-your-agent
building/implementation/orchestrator-design	building/operating/orchestrator-design
building/implementation/async-operations	building/by-layer/L3/async-operations
building/build-an-agent	building/by-layer/L4/build-an-agent
building/integration/authentication	building/by-layer/L2/authentication
building/conformance	building/verification/conformance
building/understanding/industry-landscape	building/concepts/industry-landscape
building/integration/context-sessions	building/by-layer/L2/context-sessions
building/implementation/seller-integration	building/operating/seller-integration
building/understanding/protocol-comparison	building/concepts/protocol-comparison
building/get-test-ready	building/verification/get-test-ready
building/implementation/comply-test-controller	building/by-layer/L3/comply-test-controller

Every replacement target was verified to exist as an .mdx file in the current tree. No content changes — purely mechanical path updates.

Test plan

• Pre-commit hooks pass (unit tests, typecheck, image quality)
• Pre-push Mintlify broken-links check passes ("no broken links found")
• Spot-checked representative diffs in intro.mdx, faq.mdx, quickstart.mdx, and task reference pages
• Verify links resolve correctly on the deployed docs site

[aao-release-bot]

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