test: strengthen platform-native lifecycle coverage

[ostapondo]

Summary

• add machine-readable bounded doctor --json health snapshots and locale-independent Windows task state checks
• cover macOS LaunchAgent and Windows Task Scheduler lifecycle, restart races, registration reloads, malformed definitions, and package replacement
• prove source reconnect and full-queue durability, corrupted-index rebuild, torn-ledger recovery, and capacity/permission failure handling
• keep native service registrations on a stable per-user binary across npm package updates

Safety and privacy

• health output reuses the existing bounded, typed, redacted doctor snapshot
• test-only capacity failure injection is available only in debug builds
• no repair, approval, evidence, raw path, model payload, or remote telemetry behavior changes
• MCP needs no schema change: its existing read-only health tool already projects the same bounded snapshot

Validation

• cargo fmt --check
• cargo test --workspace
• cargo clippy --workspace --all-targets -- -D warnings
• ./scripts/validate-logging.sh
• ./scripts/validate-observation-recovery.sh
• ./scripts/validate-storage-failures.sh
• ./scripts/validate-mcp.sh
• ./scripts/e2e-macos-service.sh