v1.4.0 — Unified Governance Shape and Structured Observability

• Canonical governance prelude order across rules, strategies, flags, and expert rules, with rollout before when.
• Explicit kill-switch state preserved end to end with kill_switch on/off semantics in runtime, introspection, and override surfaces.
• Typed declarations (input, feature, fact, outcome, table) now surface as one family, with stronger authoring doctrine for readable .arb modules.
• Structured observability vocabulary now runs end to end across rules, flags, strategies, expert sessions, gRPC TraceStep responses, and audit payloads.
• Override snapshots, watch events, and audit mutations now expose explicit kill_switch_state instead of forcing operators to reconstruct intent from paired bool fields.
• VM/data-context lookup improvements reduced governed-eval time and allocations across the benchmark suite.