Name the wayfinder unit a "decision ticket"

People kept reading a wayfinder ticket as an ordinary implementation
ticket — a slice of a build to execute — when wayfinder uses them as
decision tickets: questions whose resolution is a decision.

Introduce "decision ticket" as a light leading word: the skill
description and its opening line name it (and say what makes it one),
and the ask-matt / engineering README blurbs and the docs page match,
while "ticket" stays the everyday word once the term is established.
Record "Decision ticket" in CONTEXT.md so the "avoid: ticket" domain
rule no longer contradicts wayfinder's deliberate use of the word.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

CONTEXT.md

@@ -10,7 +10,10 @@ _Avoid_: backlog manager, backlog backend, issue host
 
 **Issue**:
 A single tracked unit of work inside an **Issue tracker** — a bug, task, spec, or slice produced by `to-tickets`.
-_Avoid_: ticket (use only when quoting external systems that call them tickets)
+_Avoid_: ticket (use only when quoting external systems that call them tickets, or for a **Decision ticket** — see below)
+
+**Decision ticket**:
+A `wayfinder` unit — a child **Issue** of a `wayfinder:map` holding a *question* whose resolution is a decision, not a slice of a build to execute. The **decision** qualifier is what keeps it distinct from an implementation ticket; `wayfinder` introduces the term, then uses "ticket".
 
 **Triage role**:
 A canonical state-machine label applied to an **Issue** during triage (e.g. `needs-triage`, `ready-for-afk`). Each role maps to a real label string in the **Issue tracker** via `docs/agents/triage-labels.md`.
@@ -19,6 +22,7 @@ A canonical state-machine label applied to an **Issue** during triage (e.g. `nee
 
 - An **Issue tracker** holds many **Issues**
 - An **Issue** carries one **Triage role** at a time
+- A **Decision ticket** is an **Issue** (a child of a `wayfinder:map`)
 
 ## Flagged ambiguities