[SDK] Update package READMEs with correct naming and documentation links

[joaquim-verges]

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PR-Codex overview

This PR updates the documentation for the insight and engine packages, reflecting changes in their purpose and specifications. It also adds a link to the vault-sdk documentation.

Detailed summary

• Updated packages/insight/README.md to introduce the Insight OpenAPI TypeScript Wrapper.
• Revised packages/vault-sdk/README.md to include a link to its documentation.
• Changed packages/engine/README.md to describe the Engine OpenAPI TypeScript wrapper.
• Updated auto-generation source URL from Insight to Engine.

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[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
docs-v2	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 16, 2025 0:56am
login	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 16, 2025 0:56am
thirdweb_playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 16, 2025 0:56am
thirdweb-www	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 16, 2025 0:56am
wallet-ui	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 16, 2025 0:56am

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Latest commit: a2a5299

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[joaquim-verges]

• [SDK] Update package READMEs with correct naming and documentation links #7071 👈 (View in Graphite)
• main

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[github-actions]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
thirdweb (esm)	54.18 KB (0%)	1.1 s (0%)	403 ms (+41.33% 🔺)	1.5 s
thirdweb (cjs)	194.07 KB (0%)	3.9 s (0%)	1.2 s (+21.1% 🔺)	5.1 s
thirdweb (minimal + tree-shaking)	5.68 KB (0%)	114 ms (0%)	165 ms (+959.04% 🔺)	278 ms
thirdweb/chains (tree-shaking)	524 B (0%)	11 ms (0%)	16 ms (+166.12% 🔺)	26 ms
thirdweb/react (minimal + tree-shaking)	19.53 KB (0%)	391 ms (0%)	159 ms (+274.25% 🔺)	549 ms

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.49%. Comparing base (d0c2ac6) to head (a2a5299).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7071      +/-   ##
==========================================
+ Coverage   55.47%   55.49%   +0.02%     
==========================================
  Files         909      909              
  Lines       58406    58406              
  Branches     4071     4069       -2     
==========================================
+ Hits        32401    32415      +14     
+ Misses      25902    25886      -16     
- Partials      103      105       +2     

Flag	Coverage Δ
packages	55.49% <ø> (+0.02%)	⬆️

see 4 files with indirect coverage changes

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