Improve connection handling stubs

[leynos]

Summary

• warn when connection handling is triggered
• prevent server from compiling in release
• document current connection limitations

Testing

• cargo clippy -- -D warnings
• RUSTFLAGS="-D warnings" cargo test
• markdownlint README.md docs/*.md (fails: many MD013 errors)
• nixie docs/preamble-validator.md docs/rust-binary-router-library-design.md docs/roadmap.md docs/rust-testing-with-rstest-fixtures.md README.md

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https://chatgpt.com/codex/tasks/task_e_684e9c68fa648322aa2cbcfc2f3c2c08

Summary by Sourcery

Warn and close connections in the unimplemented handle_connection stub, add logging support, document current connection-handling limitations including release build prevention, and update example code annotations accordingly

Enhancements:

• Log a warning and immediately close the connection in the handle_connection stub after the preamble phase
• Yield to the scheduler in the handle_connection placeholder to avoid blocking

Build:

• Add the log = "0.4" dependency in Cargo.toml

Documentation:

• Document current connection processing limitations and release build prevention in the README
• Annotate the WireframeServer example code block as ignore in the server documentation

[sourcery-ai]

Reviewer's Guide

This PR refines the placeholder connection handler to warn and close streams, prevents accidental use by documenting compile-time limitations in release builds, updates code examples to ignore unimplemented behavior, and adds the log dependency.

File-Level Changes

Change	Details	Files
Introduce warning and immediate close in handle_connection stub	Log a warning when handle_connection is invoked Update doc comment to explain preamble-based close behavior Retain tokio task yield for async context	src/app.rs
Add log crate dependency	Include log = "0.4" in Cargo.toml dependencies	Cargo.toml
Document current connection limitations in README	Insert 'Current Limitations' section explaining preamble close and release build guard	README.md
Annotate server example to ignore unimplemented preamble handling	Mark code block with ignore directive Add placeholder imports and struct in example	src/server.rs

Possibly linked issues

• Create design roadmap for rust-binary-router-library #1: The PR adds logging, prevents release compilation, and documents the stub behavior described in the issue.

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📥 Commits

Reviewing files that changed from the base of the PR and between d81ba91 and 83c8eba.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (4)

• Cargo.toml (1 hunks)
• README.md (1 hunks)
• src/app.rs (1 hunks)
• src/server.rs (2 hunks)

✨ Finishing Touches

• 📝 Generate Docstrings

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[codescene-delta-analysis]

Gates Passed
6 Quality Gates Passed

See analysis details in CodeScene

Absence of Expected Change Pattern

• wireframe/src/server.rs is usually changed with: wireframe/src/extractor.rs, wireframe/src/middleware.rs

Quality Gate Profile: Pay Down Tech Debt
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[sourcery-ai]

Hey @leynos - I've reviewed your changes and they look great!

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