# [DEF:backend.src.scripts.clean_release_tui:Module]
# @TIER: CRITICAL
# @SEMANTICS: tui, clean-release, ncurses, operator-flow, placeholder
# @PURPOSE: Provide clean release TUI entrypoint placeholder for phased implementation.
# @LAYER: UI
# @RELATION: BINDS_TO -> specs/023-clean-repo-enterprise/ux_reference.md
# @INVARIANT: Entry point is executable and does not mutate release data in placeholder mode.

# @PRE: Python runtime is available.
# @POST: Placeholder message is emitted and process exits with success.
# @UX_STATE: READY -> Displays profile hints and allowed internal sources
# @UX_STATE: RUNNING -> Triggered by operator action (F5), check in progress
# @UX_STATE: BLOCKED -> Violations are displayed with remediation hints
# @UX_FEEDBACK: Console lines provide immediate operator guidance
# @UX_RECOVERY: Operator re-runs check after remediation from the same screen
# @TEST_CONTRACT: TuiEntrypointInput -> ExitCodeInt
# @TEST_SCENARIO: startup_ready_state -> main prints READY and returns 0
# @TEST_FIXTURE: tui_placeholder -> INLINE_JSON
# @TEST_EDGE: stdout_unavailable -> process returns non-zero via runtime exception propagation
# @TEST_EDGE: interrupted_execution -> user interruption terminates process
# @TEST_EDGE: invalid_terminal -> fallback text output remains deterministic
# @TEST_INVARIANT: placeholder_no_mutation -> VERIFIED_BY: [startup_ready_state]


def main() -> int:
    print("Enterprise Clean Release Validator (TUI placeholder)")
    print("Allowed Internal Sources:")
    print(" - repo.intra.company.local")
    print(" - artifacts.intra.company.local")
    print(" - pypi.intra.company.local")
    print("Status: READY")
    print("Use F5 to run check; BLOCKED state will show external-source violation details.")
    return 0


if __name__ == "__main__":
    raise SystemExit(main())
# [/DEF:backend.src.scripts.clean_release_tui:Module]