Three-pronged fix for intermittent pabot-parallel race condition in
M4 validation integration tests:
1. Composable Setup Database Isolation keyword in common.resource
gives each suite a unique CLEVERAGENTS_DATABASE_URL so concurrent
pabot workers never contend on the same SQLite file.
2. Per-suite CLEVERAGENTS_HOME directories prevent shared temp
directory cleanup from racing between workers.
3. Centralised reset_global_state() in robot/helpers_common.py clears
Settings singleton, DI container, provider registry, and engine
cache between chained CLI invocations in helper processes.
Also:
- Setup Test Environment now accepts optional mock_ai and
auto_apply_migrations arguments (default TRUE) for backward
compatibility while allowing suites to opt out.
- Added Suite Teardown to cli_plan_context_commands.robot.
- Fixed _COMMANDS typing in two helpers to eliminate type: ignore.
- Updated docs/development/testing.md to reflect helpers_common
delegation pattern.
- Added timeout=30s to all Run Process calls in
m4_e2e_verification.robot.
Fixes: #563
Brent E. Edwards