chore: bootstrap independent git workflow

Co-Authored-By: Paperclip <noreply@paperclip.ing>

examples/fixtures/EXPECTED_RESULTS.md

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+# Expected Results
+
+Use these assertions when verifying `connect`, `inspect`, `query`, and `export`.
+
+## PostgreSQL
+
+- schema: `qa_demo`
+- tables: `accounts`, `tickets`
+
+## MySQL
+
+- database: `qa_demo`
+- tables: `accounts`, `tickets`
+
+## SQLite
+
+- file: `examples/tmp/dbtool-demo.sqlite`
+- tables: `accounts`, `tickets`
+
+## Shared Data Assertions
+
+- `accounts` row count: `3`
+- `tickets` row count: `4`
+- open tickets: `3`
+- closed tickets: `1`
+- at least one `NULL` value exists in `tickets.notes`
+- at least one multilingual value exists in `accounts.display_name`
+- export query returns `4` rows ordered by `ticket_id`

examples/fixtures/mysql/init.sql

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+DROP DATABASE IF EXISTS qa_demo;
+CREATE DATABASE qa_demo CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+GRANT ALL PRIVILEGES ON qa_demo.* TO 'dbtool'@'%';
+FLUSH PRIVILEGES;
+USE qa_demo;
+
+CREATE TABLE accounts (
+  id BIGINT PRIMARY KEY,
+  email VARCHAR(255) NOT NULL UNIQUE,
+  display_name VARCHAR(255) NULL,
+  is_active BOOLEAN NOT NULL,
+  created_at TIMESTAMP NOT NULL
+);
+
+CREATE TABLE tickets (
+  id BIGINT PRIMARY KEY,
+  account_id BIGINT NOT NULL,
+  title VARCHAR(255) NOT NULL,
+  status VARCHAR(32) NOT NULL,
+  notes TEXT NULL,
+  amount_cents INT NOT NULL,
+  created_at TIMESTAMP NOT NULL,
+  CONSTRAINT fk_tickets_account FOREIGN KEY (account_id) REFERENCES accounts(id)
+);
+
+INSERT INTO accounts (id, email, display_name, is_active, created_at) VALUES
+  (1, 'alice@example.com', 'Alice', TRUE, '2026-03-01 08:30:00'),
+  (2, 'maria@example.com', 'Máría', FALSE, '2026-03-10 09:45:00'),
+  (3, 'zhang@example.com', '张敏', TRUE, '2026-03-15 12:00:00');
+
+INSERT INTO tickets (id, account_id, title, status, notes, amount_cents, created_at) VALUES
+  (101, 1, 'login timeout', 'open', NULL, 0, '2026-03-20 10:00:00'),
+  (102, 1, 'csv export mismatch', 'closed', 'fixed after re-run', 1500, '2026-03-21 11:15:00'),
+  (103, 2, '权限验证', 'open', 'needs DBA review', 300, '2026-03-22 15:30:00'),
+  (104, 3, 'emoji smoke 😀', 'open', NULL, 42, '2026-03-23 07:05:00');

examples/fixtures/postgres/init.sql

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+DROP SCHEMA IF EXISTS qa_demo CASCADE;
+CREATE SCHEMA qa_demo;
+SET search_path TO qa_demo;
+
+CREATE TABLE accounts (
+  id BIGINT PRIMARY KEY,
+  email TEXT NOT NULL UNIQUE,
+  display_name TEXT,
+  is_active BOOLEAN NOT NULL,
+  created_at TIMESTAMPTZ NOT NULL
+);
+
+CREATE TABLE tickets (
+  id BIGINT PRIMARY KEY,
+  account_id BIGINT NOT NULL REFERENCES accounts(id),
+  title TEXT NOT NULL,
+  status TEXT NOT NULL,
+  notes TEXT,
+  amount_cents INTEGER NOT NULL,
+  created_at TIMESTAMPTZ NOT NULL
+);
+
+INSERT INTO accounts (id, email, display_name, is_active, created_at) VALUES
+  (1, 'alice@example.com', 'Alice', TRUE, '2026-03-01T08:30:00Z'),
+  (2, 'maria@example.com', 'Máría', FALSE, '2026-03-10T09:45:00Z'),
+  (3, 'zhang@example.com', '张敏', TRUE, '2026-03-15T12:00:00Z');
+
+INSERT INTO tickets (id, account_id, title, status, notes, amount_cents, created_at) VALUES
+  (101, 1, 'login timeout', 'open', NULL, 0, '2026-03-20T10:00:00Z'),
+  (102, 1, 'csv export mismatch', 'closed', 'fixed after re-run', 1500, '2026-03-21T11:15:00Z'),
+  (103, 2, '权限验证', 'open', 'needs DBA review', 300, '2026-03-22T15:30:00Z'),
+  (104, 3, 'emoji smoke 😀', 'open', NULL, 42, '2026-03-23T07:05:00Z');

examples/fixtures/sqlite/init.sql

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+PRAGMA foreign_keys = OFF;
+DROP TABLE IF EXISTS tickets;
+DROP TABLE IF EXISTS accounts;
+PRAGMA foreign_keys = ON;
+
+CREATE TABLE accounts (
+  id INTEGER PRIMARY KEY,
+  email TEXT NOT NULL UNIQUE,
+  display_name TEXT,
+  is_active INTEGER NOT NULL,
+  created_at TEXT NOT NULL
+);
+
+CREATE TABLE tickets (
+  id INTEGER PRIMARY KEY,
+  account_id INTEGER NOT NULL,
+  title TEXT NOT NULL,
+  status TEXT NOT NULL,
+  notes TEXT,
+  amount_cents INTEGER NOT NULL,
+  created_at TEXT NOT NULL,
+  FOREIGN KEY (account_id) REFERENCES accounts(id)
+);
+
+INSERT INTO accounts (id, email, display_name, is_active, created_at) VALUES
+  (1, 'alice@example.com', 'Alice', 1, '2026-03-01T08:30:00Z'),
+  (2, 'maria@example.com', 'Máría', 0, '2026-03-10T09:45:00Z'),
+  (3, 'zhang@example.com', '张敏', 1, '2026-03-15T12:00:00Z');
+
+INSERT INTO tickets (id, account_id, title, status, notes, amount_cents, created_at) VALUES
+  (101, 1, 'login timeout', 'open', NULL, 0, '2026-03-20T10:00:00Z'),
+  (102, 1, 'csv export mismatch', 'closed', 'fixed after re-run', 1500, '2026-03-21T11:15:00Z'),
+  (103, 2, '权限验证', 'open', 'needs DBA review', 300, '2026-03-22T15:30:00Z'),
+  (104, 3, 'emoji smoke 😀', 'open', NULL, 42, '2026-03-23T07:05:00Z');