Implement sqliteq v0.1 core

Author: Евгений Балякин

.github/workflows/bench.yml

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+name: Bench
+
+on:
+  workflow_dispatch:
+
+jobs:
+  bench:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - run: cargo run -p sqliteq-cli -- bench --db bench.db --markdown

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  test:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - run: cargo fmt --check
+      - run: cargo clippy --workspace --all-targets -- -D warnings
+      - run: cargo test --workspace

.github/workflows/release.yml

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+name: Release
+
+on:
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - run: cargo build --release --workspace

.gitignore

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+/target/
+/*.db
+/*.db-shm
+/*.db-wal
+/bench.db
+/sqliteq.db
+/SQLITEQ_SPEC.md
+.DS_Store

CHANGELOG.md

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+# Changelog
+
+## 0.1.0
+
+- Added the initial SQLite queue core with watcher wakeups and fallback wake tracking
+- Added enqueue, claim, ack, nack, batch claim, stats, purge, and transactional enqueue APIs
+- Added the `sqliteq` CLI with queue, worker, stats, purge, benchmark, init, and version commands
+- Added integration tests and launch documentation

CONTRIBUTING.md

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+# Contributing
+
+## Local Setup
+
+```bash
+cargo test
+cargo fmt --check
+cargo clippy --workspace --all-targets -- -D warnings
+```
+
+Keep changes small and include a focused test for queue behavior. Benchmarks must report real local measurements and
+must include the command used to produce them.