fix(clippy): chunks_exact_to_as_chunks + result_large_err from a newer stable clippy

[getappz]

CI's clippy job pins dtolnay/rust-toolchain # stable, which floats. A newer stable Rust/clippy (1.98.0, per the lint doc URLs) started blocking CI on every open PR (#572, #573) on pre-existing code -- confirmed unrelated to either PR's own diff by reproducing the exact same failure against a clean master checkout.

• documents.rs (x2) / embed.rs: chunks_exact(4) -> as_chunks::<4>().0, clippy's own suggested fix (chunks_exact_to_as_chunks); same remainder-dropping behavior as before.
• forward.rs: check_status's Err(Response) boxed (clippy::result_large_err -- axum::http::Response is >=128 bytes), updating its three match-arm callers to deref.

Test plan

• cargo test -p agentflare-store -p flare-proxy (190/190)
• cargo clippy -p agentflare-store -p flare-proxy --all-targets --all-features -- -D warnings -A unsafe_code -A clippy::pedantic (clean)
• cargo fmt -p agentflare-store -p flare-proxy -- --check (clean)

Summary by CodeRabbit

• Bug Fixes
  • Improved proxy error handling so upstream failures consistently preserve their original status codes and response format.
  • Improved reliability when decoding stored and generated vector embeddings without changing search behavior or validation.
• Compatibility
  • Existing successful requests and vector search results remain unchanged.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 24803b0 and 17182cc.

📒 Files selected for processing (3)

• crates/agentflare-store/src/documents.rs
• crates/agentflare-store/src/embed.rs
• crates/flare-proxy/src/forward.rs

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📝 Walkthrough

Walkthrough

The change updates embedding byte decoding to use fixed-size chunks and changes proxy upstream error handling to return boxed responses while preserving status and error-body formatting.

Changes

Embedding decoding

Layer / File(s)	Summary
Fixed-size embedding decoding crates/agentflare-store/src/documents.rs, crates/agentflare-store/src/embed.rs	Embedding bytes are decoded with as_chunks::<4>() and converted from little-endian bytes to f32 values.

Proxy error handling

Layer / File(s)	Summary
Boxed upstream status responses crates/flare-proxy/src/forward.rs	check_status returns boxed non-success responses. The Anthropic, Gemini, and OpenAI-compatible paths dereference these responses before returning them. Status codes, JSON content type, and Anthropic-formatted error bodies remain unchanged.

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

Merge Risk: ⚪ Minimal · up to 17182

This PR makes localized lint-driven code updates and reports passing tests, clippy, and formatting checks; no actionable merge-blocking risk remains beyond normal review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description explains the changes, motivation, affected files, and test results, but it omits the Notes for reviewers section.
Title check	✅ Passed	The title clearly identifies the Clippy-related fixes and the two main lint changes.
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.

✨ 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 task/521-fix-clippy-chunks-exact-to-as-chunks-res

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