refactor(tasks): flatten test tasks into mise.toml with inline usage

Moves all test task definitions into mise.toml using inline scripts
and the usage field for flag definitions. This is the proper way to
define flags in TOML tasks.

Changes:
- Define test task inline in mise.toml with usage field
- Move test:legacy, test:sqlx tasks to mise.toml
- Remove tasks/test.sh, tasks/rust.toml, tasks/test.toml
- Update mise.toml includes (remove rust.toml, test.toml)

Key fix:
- Use "usage" field in TOML for flag definitions
- Variables available as ${usage_postgres} in run script
- No need for separate shell script files

Structure:
mise.toml (all task definitions inline)
├─ test (inline with usage field for --postgres flag)
├─ test:legacy → tasks/test-legacy.sh
└─ test:sqlx (inline script)

CI compatibility:
✓ Accepts --postgres flag: mise run test --postgres ${VERSION}
✓ TOML usage field properly sets usage_postgres variable
✓ Simpler structure (3 files removed)

Author: tobyhede

mise.toml

@@ -7,7 +7,10 @@
 #     "./tests/mise.tls.toml",
 # ]
 [task_config]
-includes = ["tasks", "tasks/postgres.toml", "tasks/rust.toml", "tasks/test.toml"]
+includes = [
+  "tasks",
+  "tasks/postgres.toml",
+]
 
 [env]
 POSTGRES_DB = "cipherstash"
@@ -27,4 +30,79 @@ run = """
 [tasks."test"]
 description = "Run all tests (legacy SQL + SQLx Rust)"
 sources = ["src/**/*_test.sql", "tests/**/*.sql", "tests/sqlx/**/*.rs"]
-run = "{{config_root}}/tasks/test-all.sh"
+usage = '''
+flag "--postgres <version>" help="PostgreSQL version to test against" default="17"
+'''
+run = '''
+#!/bin/bash
+set -euo pipefail
+
+POSTGRES_VERSION=${usage_postgres:-17}
+
+echo "=========================================="
+echo "Running Complete EQL Test Suite"
+echo "PostgreSQL Version: $POSTGRES_VERSION"
+echo "=========================================="
+echo ""
+
+# Check PostgreSQL is running
+{{config_root}}/tasks/check-postgres.sh ${POSTGRES_VERSION}
+
+# Build first
+echo "Building EQL..."
+mise run build --force
+
+# Run legacy SQL tests
+echo ""
+echo "=========================================="
+echo "1/2: Running Legacy SQL Tests"
+echo "=========================================="
+mise run test:legacy --postgres ${POSTGRES_VERSION}
+
+# Run SQLx Rust tests
+echo ""
+echo "=========================================="
+echo "2/2: Running SQLx Rust Tests"
+echo "=========================================="
+mise run test:sqlx
+
+echo ""
+echo "=========================================="
+echo "✅ ALL TESTS PASSED"
+echo "=========================================="
+echo ""
+echo "Summary:"
+echo "  ✓ Legacy SQL tests"
+echo "  ✓ SQLx Rust tests"
+echo ""
+'''
+
+[tasks."test:legacy"]
+description = "Run legacy SQL tests (inline test files)"
+sources = ["src/**/*_test.sql", "tests/*.sql"]
+run = "{{config_root}}/tasks/test-legacy.sh"
+
+[tasks."test:sqlx"]
+description = "Run SQLx tests with hybrid migration approach"
+dir = "{{config_root}}"
+env = { DATABASE_URL = "postgresql://{{get_env(name='POSTGRES_USER', default='cipherstash')}}:{{get_env(name='POSTGRES_PASSWORD', default='password')}}@{{get_env(name='POSTGRES_HOST', default='localhost')}}:{{get_env(name='POSTGRES_PORT', default='7432')}}/{{get_env(name='POSTGRES_DB', default='cipherstash')}}" }
+run = """
+# Copy built SQL to SQLx migrations (EQL install is generated, not static)
+echo "Updating SQLx migrations with built EQL..."
+cp release/cipherstash-encrypt.sql tests/sqlx/migrations/001_install_eql.sql
+
+# Run SQLx migrations and tests
+echo "Running SQLx migrations..."
+cd tests/sqlx
+sqlx migrate run
+
+echo "Running Rust tests..."
+cargo test
+"""
+
+[tasks."test:sqlx:watch"]
+description = "Run SQLx tests in watch mode (rebuild EQL on changes)"
+dir = "{{config_root}}/tests/sqlx"
+run = """
+cargo watch -x test
+"""