Struct EventTag 

pub struct EventTag {
    pub attached: Option<EventType>,
    pub category: EventCategory,
}

Provenance tag carried alongside a log message so display sinks can route by kind, not by sniffing message text.

The only consumer today is the tui=terminal log sink: it owns a managed phase-history region (the idempotent catch-up projection of the scene tree), so the phase start/end readout lines that would otherwise scroll past in the log stream are tagged attached: PhaseStart and suppressed from that stream — they live in the region instead. Every other surface (session.log, the failure dump, the full TUI panel) treats all events alike; the tag is purely additive.

The tag is TWO ORTHOGONAL AXES (they were one conflated enum once, with Diagnostic — “anything else” — riding beside boundary-attached kinds, and sinks keying presentation rules off the conflation):

• EventTag::attached — WHERE on the execution lifecycle the event belongs, in the canonical lifecycle vocabulary (crate::lifecycle::EventType: session/scope/each/phase boundaries). None = in-flight — emitted from the running body, bound to no boundary.
• EventTag::category — WHAT the event is about (EventCategory): the semantic domain, independent of when it fired.

Presentation rules derive from the axes instead of naming bundles: “hide phase-start renders from scrollback” keys on attached == Some(PhaseStart); “the TUI log panel shows only in-flight diagnostics” keys on attached.is_none(); “detail rows fold with their block” keys on attached == Some(PhaseEnd) && category != Outcome.

Fields

attached: Option<EventType>

The execution-lifecycle boundary this event is attached to; None = in-flight.

category: EventCategory

Semantic category.

Implementations

impl EventTag

pub const fn in_flight(category: EventCategory) -> Self

An in-flight event of the given category (no boundary).

pub const fn at(moment: EventType, category: EventCategory) -> Self

An event attached to a lifecycle boundary.

Trait Implementations

impl Clone for EventTag

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for EventTag

impl Debug for EventTag

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for EventTag

fn default() -> Self

Returns the “default value” for a type.

impl Eq for EventTag

impl PartialEq for EventTag

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for EventTag