docs: add domain model glossary in CONTEXT.md

CONTEXT.md

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+# The Programmers Hangout Website
+
+The public, statically-generated (Gatsby) website for The Programmers Hangout, a
+programming community on Discord. Its purpose is to present the community and to
+publish community-authored educational content. All content originates as
+Markdown/MDX files under `src/content`.
+
+## Content
+
+**Resource**:
+A community-authored educational article, sourced from a Markdown/MDX file under
+`src/content/resources`. Every Resource belongs to exactly one Language or Topic.
+_Avoid_: Article, doc, post, tutorial (for the outbound-link sense, see External Reference).
+
+**Language**:
+A resource category named after a programming language (e.g. JavaScript, Python).
+One of the two kinds of resource category.
+_Avoid_: Lang.
+
+**Topic**:
+A resource category named after a subject area that is not tied to a single
+language (e.g. web-development, cryptography, bot-development). The other kind of
+resource category.
+_Avoid_: Category, subject, section.
+
+**Spotlight**:
+A short "What is X?" feature article introducing a single technology, tool, or
+framework. Sourced from `src/content/spotlights`. Distinct from a Resource: it is
+a standalone introduction rather than a categorised teaching article.
+_Avoid_: Feature, highlight, showcase.
+
+**External Reference**:
+An outbound link (text + href) attached to a Resource under
+`external_resources`, pointing at authoritative material elsewhere on the web.
+_Avoid_: Resource, link (both are ambiguous — a Resource is our own content).
+
+**Recommended Reading**:
+An internal cross-link from one Resource to another, listed under
+`recommended_reading`. Points only at other Resources on this site.
+_Avoid_: Related, see-also.
+
+## People
+
+**Author**:
+A community member credited on a Resource or Spotlight, written in frontmatter as
+a Discord tag (`name#hash`). The identity as it appears in content.
+_Avoid_: Writer, contributor, creator.
+
+**User**:
+A Discord guild member of The Programmers Hangout, fetched from the Discord API
+into `users.json`. Users exist only to resolve an Author's tag to a real avatar;
+when no matching User is found, a default Discord avatar is used.
+_Avoid_: Member, author (an Author is a credit; a User is a Discord account).
+
+**Role**:
+A Discord role, rendered inline in content as a coloured pill. Refers to the
+community's Discord roles, not to any website permission.
+_Avoid_: Badge, tag, permission.
+
+## Presentation
+
+**Layout**:
+The page-shell variant a page renders inside, chosen from `home`, `resources`,
+`spotlights`, and `regular`. Determines sidebar and chrome, not content.
+_Avoid_: Template, theme.