The dependency maintenance run completed cleanly. Here's a summary:

## What Was Updated

3 patch-level updates were applied via `cargo update`:

| Package | Before | After | Type |
|---------|--------|-------|------|
| `tokio` | 1.52.2 | **1.52.3** | Direct |
| `cc` | 1.2.61 | **1.2.62** | Transitive (build tool) |
| `hashbrown` | 0.17.0 | **0.17.1** | Transitive (via `indexmap`) |

No minor or major bumps were needed — all direct dependencies were already at their latest minor versions within their declared semver ranges.

## Quality Gates — All Passed ✅

- **format** — `cargo fmt --check` clean
- **lint** — `cargo clippy` 0 warnings  
- **test** — 403 tests + 14 doctests passed
- **build** — clean
- **coverage** — tarpaulin threshold met
- **security-deny** — no advisories, bans, or license issues
- **security-audit** — clean across 268 crate dependencies

Since `Cargo.lock` is gitignored for this library crate (correct convention — consumers resolve their own lockfiles), there's nothing to commit.