style: apply rustfmt across current workspace

[aaltshuler]

What and why

Supersedes #448 with a clean-slate formatter sweep generated from current main, after removal of the RFC-026/WAL implementation and the #450/#447 query merges.

This is the verbatim output of cargo fmt --all: 42 tracked Rust files, +4,873/-4,309 lines. It changes only layout and carries no semantic, dependency, generated-file, documentation, or persisted-format change.

Compared with #448, the replacement drops 28 obsolete files from the diff, including all deleted streaming/WAL code.

Verification

• cargo fmt --all --check
• git diff --check
• bash scripts/check-agents-md.sh
• Independent reproduction from a pristine origin/main archive produced the same 42 files with zero byte mismatches.
• cargo test --workspace --locked --no-fail-fast: every non-spawn target passed. The external shared target directory prevented two CLI suites from discovering omnigraph-server; rerunning those exact suites with explicit built binary paths passed: parity 13/13 and system-local 27 passed, 1 credentialed test ignored.

Clippy cleanup and a permanent fmt/clippy CI gate remain separate follow-ups.

Greptile Summary

This PR applies cargo fmt --all across 42 Rust files without changing program semantics, public interfaces, dependencies, or persisted formats.

• Reformats CLI helpers, configuration code, and associated integration tests.
• Reformats cluster orchestration tests and failpoint coverage.
• Reformats server query code and authorization, boot, multi-graph, and stored-query tests.
• Reformats core query and embedding code plus engine tests, examples, and benchmarks.

Confidence Score: 5/5

The PR appears safe to merge because the changes are confined to rustfmt-generated layout and whitespace updates.

No changed expression, control-flow decision, public contract, security boundary, dependency, or persisted representation was identified; the formatter sweep preserves the existing Rust syntax and behavior.

Important Files Changed

Filename	Overview
crates/omnigraph-cli/src/helpers.rs	Rustfmt-only wrapping and whitespace changes preserve CLI URL construction, scope resolution, and query validation behavior.
crates/omnigraph-cluster/src/tests.rs	Large indentation and line-wrapping cleanup preserves the cluster orchestration test logic and assertions.
crates/omnigraph-server/src/queries.rs	Formatting-only changes preserve stored-query registry behavior.
crates/omnigraph/src/embedding.rs	Formatting-only changes preserve embedding configuration, request, retry, and validation logic.
crates/omnigraph/src/exec/query.rs	Formatting-only changes preserve query execution, traversal, search, and projection behavior.

_{Reviews (1): Last reviewed commit: "style: apply rustfmt across current work..." | Re-trigger Greptile}