Swapped 'backlog' for 'issue tracker

Co-authored-by: Copilot <copilot@github.com>

CONTEXT.md

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+# Matt Pocock Skills
+
+A collection of agent skills (slash commands and behaviors) loaded by Claude Code. Skills are organized into buckets and consumed by per-repo configuration emitted by `/setup-matt-pocock-skills`.
+
+## Language
+
+**Issue tracker**:
+The tool that hosts a repo's issues — GitHub Issues, Linear, a local `.scratch/` markdown convention, or similar. Skills like `to-issues`, `to-prd`, `triage`, and `qa` read from and write to it.
+_Avoid_: backlog manager, backlog backend, issue host
+
+**Issue**:
+A single tracked unit of work inside an **Issue tracker** — a bug, task, PRD, or slice produced by `to-issues`.
+_Avoid_: ticket (use only when quoting external systems that call them tickets)
+
+**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`.
+
+## Relationships
+
+- An **Issue tracker** holds many **Issues**
+- An **Issue** carries one **Triage role** at a time
+
+## Flagged ambiguities
+
+- "backlog" was previously used to mean both the *tool* hosting issues and the *body of work* inside it — resolved: the tool is the **Issue tracker**; "backlog" is no longer used as a domain term.
+- "backlog backend" / "backlog manager" — resolved: collapsed into **Issue tracker**.