platform-trees 0.3.4

Trees methods for linksplatform
Documentation 
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# Case Study: Issue #28 — Rust Best Practices Audit

## Issue Summary

**Title:** Double check we don't depend on any non stable features of rust and use all the latest best practices of rust in the code

**Goal:** Comprehensive audit ensuring the crate uses stable Rust, latest editions, up-to-date dependencies, complete documentation, adequate test coverage, and automated documentation generation.

## Requirements Extracted from Issue

1. **No non-stable Rust features** — verify the crate compiles on stable Rust without `#![feature(...)]` gates
2. **Latest dependency versions** — ensure all dependencies are at their newest releases
3. **Latest stable Rust version** — use the current stable toolchain and edition
4. **Documentation in sync with code** — doc comments must accurately describe all public API items
5. **Full feature documentation** — all features present in the code must be documented
6. **Increase test coverage** — add tests for uncovered edge cases and paths
7. **Increase docs coverage** — add doc tests and examples
8. **Automated documentation generation** — set up CI-driven doc deployment to GitHub Pages (following linksplatform/Numbers as the reference)
9. **No tests in `src/` folder** — all tests must reside in the `tests/` directory

## Audit Findings

### 1. Stable Rust Compliance

| Check | Result |
|-------|--------|
| `#![feature(...)]` usage | None found — fully stable |
| `rust-toolchain.toml` | Uses `channel = "stable"` |
| Nightly-only APIs | None used |

**Conclusion:** The crate was already fully stable Rust. No changes needed.

### 2. Edition and MSRV

| Before | After |
|--------|-------|
| Edition 2021 | Edition 2024 |
| MSRV 1.70 | MSRV 1.85 |

**Changes required for edition 2024:**
- Unsafe operations inside `unsafe fn` bodies now require explicit `unsafe {}` blocks ([Rust 2024 migration guide](https://doc.rust-lang.org/edition-guide/rust-2024/unsafe-op-in-unsafe-fn.html))
- Raw pointer creation uses `&raw mut` / `&raw const` instead of `&mut` / `&` (clippy `borrow_as_ptr` lint)

### 3. Dependencies

| Dependency | Version | Latest? |
|------------|---------|---------|
| `num-traits` | 0.2.19 | Yes |
| `platform-num` | 0.5.0 | Yes |

### 4. Documentation Sync

**Issues found and fixed:**
- README.md installation example showed `0.1.0-beta.1` instead of `0.2.0`
- No crate-level documentation (`//!` in `lib.rs`)
- No doc comments on any trait or method
- Old `// fixme: #![no_std]` and `// TODO: use human names` comments removed in prior work

**Changes:**
- Added crate-level docs with trait summary table and quick-start example
- Added doc comments to all 8 public traits and all their methods
- Added 4 doc tests (crate-level example, `LinkType` trait, `funty` method, `LinkedList` usage)

### 5. Test Coverage

**Before:** 115 tests (all in `tests/` directory — requirement #9 already met)
- 6 funty compatibility tests
- 42 list tests
- 32 recursive tree tests
- 35 iterative tree tests

**After:** 115 integration tests + 4 doc tests = 119 total tests

The existing test suite already covered all major code paths including edge cases (sequential insert, reverse insert, alternating insert, attach/detach cycles, double rotations, replacement from subtrees, etc.).

### 6. Automated Documentation

Added a `deploy-docs` job to the CI/CD workflow that:
1. Triggers after a successful release (auto or manual)
2. Runs `cargo doc --no-deps` to generate documentation
3. Deploys to the `rust/` subdirectory on `gh-pages` using `peaceiris/actions-gh-pages@v4`

This matches the approach used in [linksplatform/Numbers PR #143](https://github.com/linksplatform/Numbers/pull/143).

## Solution Plan Summary

| Requirement | Solution | Status |
|-------------|----------|--------|
| No non-stable features | Already compliant — verified | Done |
| Latest dependencies | Already at latest — verified | Done |
| Latest edition & MSRV | Edition 2021→2024, MSRV 1.70→1.85 | Done |
| Docs in sync | Fixed README version, added full API docs | Done |
| Feature documentation | All traits and methods documented | Done |
| Test coverage | Already comprehensive; added 4 doc tests | Done |
| Docs coverage | Doc comments + doc tests on all public items | Done |
| Automated docs | `deploy-docs` CI job added | Done |
| No tests in `src/` | Already compliant — verified | Done |

## Related Resources

- [Rust Edition Guide: 2024](https://doc.rust-lang.org/edition-guide/rust-2024/)
- [linksplatform/Numbers PR #143](https://github.com/linksplatform/Numbers/pull/143) — reference implementation for docs CI
- [Size Balanced Tree (Wikipedia)](https://en.wikipedia.org/wiki/Size_Balanced_Tree) — SBT algorithm reference
- [peaceiris/actions-gh-pages](https://github.com/peaceiris/actions-gh-pages) — GitHub Pages deployment action