fix(bridge): use real WETH addresses in README example

[Kropiunig]

Summary

Fixes #341

The bridge SDK README example uses non-token addresses as sample tokens, causing users to get "No path found" when running the example. This replaces them with real WETH contract addresses on Arbitrum and Base.

Test plan

• Verified the replacement addresses are valid WETH contracts on their respective chains

Summary by CodeRabbit

• Documentation
  • Updated bridging request example code with revised token contract addresses for supported blockchain networks to ensure accuracy across usage scenarios.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 1ec0ffe0-8e04-4f5e-8ffe-82abe9242838

📥 Commits

Reviewing files that changed from the base of the PR and between a56dead and fcf0701.

📒 Files selected for processing (1)

• packages/bridging/README.md

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📝 Walkthrough

Walkthrough

The pull request updates example token addresses in the bridging SDK documentation. The sellTokenAddress parameter for Arbitrum and buyTokenAddress parameter for Base in code examples are replaced with proper WETH token contract addresses that can be successfully bridged, resolving "no path found" errors in the existing examples.

Changes

Cohort / File(s)	Summary
Documentation Examples packages/bridging/README.md	Updated token contract addresses in QuoteBridgeRequest examples. Replaced sell and buy token addresses with functional WETH contracts for Arbitrum and Base respectively across both TypeScript code snippets.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 The tokens were ghosts, not contracts at all,
So the bridge requests answered no call.
With WETH now in place, both shiny and true,
The examples will work—old made like new! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'fix(bridge): use real WETH addresses in README example' clearly and concisely describes the main change: replacing invalid token addresses with real WETH addresses in the bridge README documentation.
Linked Issues check	✅ Passed	The PR directly addresses issue #341 by replacing the non-token addresses (0xfff9976782d46cc05630d1f6ebab18b2324d6b14 and 0x0625afb445c3b6b7b929342a04a22599fd5dbb59) with the suggested real WETH addresses (Arbitrum: 0x82af49447d8a07e3bd95bd0d56f35241523fbab1 and Base: 0x4200000000000000000000000000000000000006) in both TypeScript code snippets.
Out of Scope Changes check	✅ Passed	All changes are scoped to the README example documentation only, directly addressing the issue requirements with no unrelated modifications to code or other files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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