update masque-go documentation to the v0.4.0 release

[marten-seemann]

Update masque-go documentation to the v0.4.0 API

• Updates client.md to replace the masque.Client.DialAddr/Dial API with masque.NewRequest and masque.Transport.Dial, including examples for setting request headers and reusing QUIC connections via Transport.NewClientConn.
• Updates proxy.md to rename masque.ParseRequest → masque.ParseProxyRequest and masque.RequestParseError → masque.ProxyRequestParseError, and documents that proxy.Proxy now sends a Proxy-Status response header automatically.

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Summary by CodeRabbit

• Documentation
  • Updated CONNECT-UDP client guidance with clearer examples for connecting through a proxy, including hostname and IP targets.
  • Added instructions for setting request headers before dialing and for reusing an established QUIC connection to open multiple UDP proxy connections.
  • Refreshed proxy-side documentation to match the latest request-parsing and socket-handling examples, including Proxy-Status behavior.

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📝 Walkthrough

Walkthrough

Documentation for the CONNECT-UDP client and proxy examples was revised to reflect updated masque API usage: client docs now show masque.Transport/masque.NewRequest-based dialing and ClientConn multiplexing, while proxy docs switch examples to masque.ParseProxyRequest, masque.ProxyRequestParseError, and ProxyRequest.Target.

Changes

CONNECT-UDP documentation updates

Layer / File(s)	Summary
Client dialing basics with masque.Transport content/docs/connect-udp/client.md	Replaces masque.Client-based setup with masque.NewRequest and tr.Dial for hostname and host:port IP targets, and shows setting HTTP headers (e.g. Authorization) on the request before dialing.
Client response handling and multi-flow dialing content/docs/connect-udp/client.md	Clarifies that the returned *masque.Conn is non-nil only on proxy acceptance and that non-2xx responses cause an error with optional rsp details; replaces repeated Dial calls with a ClientConn created via tr.NewClientConn and multiple cconn.Dial calls.
Proxy request parsing update content/docs/connect-udp/proxy.md	Updates the example handler and explanatory text to use masque.ParseProxyRequest, masque.ProxyRequestParseError, and ProxyRequest.Target, passing preq into proxy.Proxy.
UDP socket management documentation content/docs/connect-udp/proxy.md	Documents that proxy.Proxy sends a Proxy-Status header on socket creation, updates the ProxyConnectedSocket example to use preq/ParseProxyRequest, and removes the Proxy-Status future-work bullet.

Estimated code review effort: 2 (Simple) | ~10 minutes

Related PRs: None specified.

Suggested labels: documentation

Suggested reviewers: None specified.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the documentation update for the masque-go v0.4.0 release.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch masque-go-v040

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch masque-go-v040

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