Add prompt-safe router state diagnostics wrapper

[Disaster-Terminator]

Motivation

• Operators need a small, auditable CLI that summarizes router health from config and structured logs without copying raw prompts or secrets into issue reports.
• The change should be a thin convenience wrapper that reuses existing parsers and helpers rather than adding monitoring subsystems or changing runtime behavior.

Description

• Add scripts/diagnose_router_state.py, a small CLI that prints [router_config] (including entry_model, fallback_route_id, route→target mapping, and hard-rule route ids) and optional [route_summary] / [route_error_budget] sections when --logs is provided.
• The script reuses router.config.load_settings, scripts/router_log_summary parsers, and scripts/check_route_error_budget helpers and emits only aggregate fields to avoid printing prompts, message contents, bearer tokens, raw request bodies, or Authorization headers.
• Add tests/test_diagnose_router_state.py with tests for stable config output, logs-enabled output including summaries and budgets, redaction of sensitive payload fields, and execution from the repo root.
• Add a small sys.path insertion in the script so it can be executed directly from the repository root as an operator command without modifying package layout or runtime routing.

Testing

• Ran uv run python -m pytest -q, which passed: 153 passed, 1 warning (the new tests included).
• Ran uv run python scripts/diagnose_router_state.py --routes config/routes.yaml which returned successfully and printed the [router_config] section.
• Automated tests include CLI checks for stable sections and redaction of messages/authorization/bearer tokens and they passed under the test suite.

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Codex Task

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