Add log ingestion tool for loading signature logs into SQLite

- Parse signature messages from log files extracting app info, device
  details, and feature flags (autofill, touchID, offline login, etc.)
- Support both plain .log and gzip compressed .log.gz files
- File discovery by date range (YYYY/mm/dd directory structure)
- Batch inserts for performance with large files (10GB+ per day)
- Index on session_id and version for efficient queries
- Extensible parser architecture via MessageParser trait

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CLAUDE.md

@@ -0,0 +1,71 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Commands
+
+### Build & Run
+```bash
+# Build
+cargo build
+
+# Release build
+cargo build --release
+
+# Run (example)
+cargo run -- --name "World"
+```
+
+### Testing
+```bash
+# Run all tests
+cargo test
+
+# Fast test execution with cargo-nextest (recommended)
+cargo nextest run
+
+# Run a single test
+cargo test test_name
+
+# Generate coverage (requires cargo-llvm-cov)
+cargo llvm-cov nextest --lcov --output-path lcov.info
+```
+
+### Quality Checks
+```bash
+# Format check
+cargo fmt -- --check
+
+# Apply formatting
+cargo fmt
+
+# Static analysis with Clippy
+cargo clippy
+```
+
+### Benchmarks
+```bash
+# Requires nightly toolchain
+cargo +nightly bench
+```
+
+## Architecture
+
+### Project Structure
+- **cargo-generate template**: This repository is a template for generating new Rust CLI projects
+- **CLI parser**: Uses clap v4 derive macros for command-line argument processing
+- **Benchmarks**: Located in `benches/` directory, uses nightly compiler's test crate
+
+### CI/CD Configuration
+- **ci.yaml**: Main CI workflow
+  - Runs formatting, Clippy, build, and tests
+  - Generates coverage on Linux with octocov reporting
+  - Automatic PR feedback via reviewdog
+- **benchmark.yaml**: Auto-deploys benchmark results to GitHub Pages
+- **audit.yaml**: Security audit for dependencies
+- **release.yaml**: Automated release on tag push (cross-platform builds via GoReleaser)
+
+### Key Settings
+- **Rust version**: Fixed to 1.87 in `rust-toolchain.toml`
+- **Edition**: Uses Rust 2024 edition
+- **Test tools**: cargo-nextest and cargo-llvm-cov recommended