refactor(tasks): flatten test tasks into mise.toml

Simplifies test task structure by moving task definitions
into main mise.toml with shell scripts for flag handling.

Changes:
- Create tasks/test.sh with MISE USAGE for --postgres flag
- Move test:legacy, test:sqlx tasks to mise.toml
- Remove tasks/rust.toml (moved to mise.toml)
- Update mise.toml includes (remove rust.toml, test.toml)

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

CI compatibility:
✓ Accepts --postgres flag: mise run test --postgres ${VERSION}
✓ Shell scripts handle MISE USAGE flags correctly
✓ Simpler structure (test.toml removed, merged into mise.toml)

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 +30,34 @@ 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"
+run = "{{config_root}}/tasks/test.sh"
+
+[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
+"""