Register context as a sub-app of the actor Typer group so commands are
accessible under the canonical specification path `agents actor context`.
The top-level `agents context` group remains as a deprecated alias
(with Typer deprecated=True) for one release cycle.
Key changes:
- context.app registered under actor.app in main.py
- `rm` subcommand renamed to `remove`; `rm` kept as hidden deprecated
alias that prints a deprecation warning before delegating
- Programmatic rm_command() deprecated in favor of remove_command()
- Help text updated to reference canonical `agents actor context` paths
- Behave and Robot tests updated to use canonical paths and renamed
subcommand; assertion for context help lowercased for flexibility
- All nox sessions pass: lint, typecheck, unit_tests (495 features,
12731 scenarios), coverage at 97%
ISSUES CLOSED: #888
- Fix Rich Console line-wrapping breaking assertions in
context_unit_tests_steps.py: collapse newlines before checking for
filenames and overflow summaries (CI temp paths exceed 80 columns)
- Fix features.mocks import failure in database_integration.robot:
replace hardcoded sys.path '/app' with portable ${CURDIR}/..
- Fix --load-context help text assertions in load_context_test.robot:
merge stderr into stdout via stderr=STDOUT and remove duplicate test
- Add standalone dead_code nox session running vulture directly
- Rename security nox session to security_scan to match CI references
- Restore --exclude discovery to integration_tests nox session (lost
during merge conflict resolution)