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feat(kit): the engagement contract, taught and built (cutover 5 of 7)
The kit was pinned to website 963d734 -- MODULE_API 1.6.0, the Teams cutover --
and the platform is on 1.9.0. Three registrations and two calls arrived in
between, and a reader building against this book would have found no mention of
any of them: a module can now declare what its game can announce, and never who
is told.

Moving `ci/core-ref.json` is the mechanism for exactly this. The pin is now
66bb3b9a (website `main`, the engagement cutover) and `template/module.json`
declares `^1.9.0`.

What chapter 2 gained, under "Telling core something happened":

  * a TRIGGER is a payload contract, not a notification stream -- the two share
    one id namespace and are constantly confused;
  * `ceiling` is required, has no default, and is a CONTAINMENT tree rather than
    a size ladder (a `staff` ceiling does not permit `owner`);
  * an AUDIENCE resolver returns user ids and nothing else, resolves to NOBODY
    on failure, and takes CONSTANT params -- the constraint worth knowing before
    you design around it;
  * templates re-ensure per seedVersion, rule groups are offered ONCE per group
    key, so a rule appended to an existing group reaches fresh installs only;
  * `ctx.events.emit` binds the owner and is fire-and-forget; `ctx.inbox.push`
    is the direct write, for when there is nothing for an operator to decide.

The template builds all of it: one trigger, one audience over the clan roster it
already had, one seeded body and one seeded rule group, and an emitter in
`boot.js` that fires on the TRANSITION rather than on the poll. Seven new tests,
including the audience that resolves to nobody when its query throws.

Three claims were wrong and are corrected here rather than shipped:

  * core validates `subjectKey` against the declared variables and refuses the
    module; the draft taught a cooldown keyed on `undefined`, which the check
    exists to prevent and a reader will never see.
  * `emit` throws OUTSIDE production and only drops-and-logs inside it. Teaching
    the second half alone leaves a developer meeting a throw the book says
    cannot happen.
  * the seeded body itself was malformed -- heading `level: 2` where the block
    registry takes 'h2', and no block ids at all.

The third is the one worth keeping: `registerEngagementSeeds` checks that
`blocks` is a non-empty array and stops, so that body would have registered,
seeded, and failed the first time an operator opened it. Found by running the
template's `register()` through core's real registry at the pinned ref -- which
CI does not do, and cannot: the template job checks the version and runs the
template against fakes. A fake accepts what core refuses. The gap is now named
in the chapter, beside the code, and in the pin's own comment, and the rule that
bit has a test that fails on it.

Also: `checkLinks` skipped `.core/`. Bumping this pin means cloning core into
that directory first, and the walk then reported nine broken links in someone
else's README. CI never saw it -- the clone happens in the `template` job and
the check runs in `prose` -- so it was a failure only a person could meet.

Co-Authored-By: Claude <noreply@anthropic.com>
2026-09-01 12:57:55 -05:00
..

The template module

A Runic Gateway module that builds, loads, and does almost nothing. Copy it, rename it, and you have a running module before you have read a chapter.

Installed into a core, it adds:

  • three public pages/examplegame/status, /examplegame/clans and one clan at /examplegame/clans/:externalId — and nav rows pointing at the first two;
  • three API routes under /api/v1/public/world and /api/v1/public/clans, described in an OpenAPI fragment core merges into its own /api/docs;
  • three tables, prefixed examplegame_, created by an idempotent schema fragment and dropped by a purge file;
  • a Team provider, which makes this module the authoritative source of Teams for the deployment — the one registration where core calls YOU and waits;
  • three inverted extension slots, declared by this module on the clan page for core to fill;
  • both lifecycle hooks, so there is something to see at boot and at shutdown.

That is deliberately less than your module will do. What it is complete about is the shape: every seam a real module uses is here once, with the reasoning next to it, and CI proves the whole thing still builds against a pinned core.

The tree

module.json                 what core reads first — id, version, coreApi, mounts
server/
  index.js                  register(ctx, api) — the entire server-side handshake
  core.js                   the lazy accessors over ctx; read this second
  boot.js                   onBoot / onShutdown
  db/schema.sql             idempotent, replayed every boot
  db/purge.sql              destructive, run only by an explicit admin purge
  model/worldStatus/        the .db.js / .model.js pair
  model/clans/              the Team provider, its SQL, and the audience rule
  router/public/            two routers, two controllers, the #swagger annotations
  swagger/doc.js            tags and schemas the annotations refer to
  scripts/checkImports.js   the module boundary, enforced
  scripts/swaggerFragment.js  generates swagger-fragment.json from your own routes
  test/                     the suites — start with entry.test.js
client/
  vite.config.js            the library build: anchored aliases, external: []
  src/entry.jsx             registers routes, nav and declared slots at evaluation time
  src/core.js               what core hands you: the UI kit (nine exports)
  src/shim/                 the four shared dependencies, re-exported from core
  src/routes/public/        the pages — Clan.jsx is the one with slots in it
  scripts/checkExternals.js asks the BUILT chunk whether a bare import survived
  test/                     build.test.js and registration.test.js
.gitea/workflows/release.yml   packaging CI — Gitea
.github/workflows/release.yml  the same, for GitHub. Keep one, delete the other.
swagger-fragment.json       generated; commit it

Neither workflow runs while it sits inside the kit — a workflow is only read from a repository root. They arm themselves when your copy is a repository of its own.

Build it

npm ci   --prefix server
npm test --prefix server
npm run check:imports --prefix server

npm ci    --prefix client
npm run build --prefix client        # → client/dist/entry.js, the chunk that ships
npm run check:externals --prefix client
npm test  --prefix client            # build FIRST: two of these tests read the chunk

npm test in client/ passes with no build, by skipping the tests that need one. That is on purpose — the suite has to be runnable before the build — and it means a CI job that tests without building is a job asking nothing. Build first.

Regenerate the OpenAPI fragment whenever a route or an annotation changes:

npm run swagger --prefix server        # writes swagger-fragment.json
npm run check:swagger --prefix server  # fails if it is stale

Install it

Three supported ways, and none of them builds anything on the operator's machine:

  1. Admin → Modules, pasting the URL of an install manifest — the JSON the release workflow attaches beside the tarball. This is how an operator installs your module.
  2. The MODULES environment variable, <id>@<version>=<manifest URL>, for a deployment that declares its module set rather than clicking it.
  3. A directory on the volume. Copy this whole tree to <website>/modules/<id>/ and restart. The fastest loop while you are developing.

For (3): copy, do not symlink. The loader lists directory entries and a symlink is not a directory, so a linked module is skipped in silence.

Rename it

Change id in module.json first, then work down the list. Nothing here is subtle, and the suites catch most of a half-finished job: schema.test.js fails the moment a table name stops matching the id, and registration.test.js fails when a nav row stops matching its route.

Your id must match ^[a-z][a-z0-9-]{1,31}$, must equal the directory name core loads you from, and becomes your table prefix — so no hyphen unless you enjoy backticking table names.

File What to change
module.json id, name, version, the mounts prefix, capabilities
.gitea/workflows/release.yml GITEA_HOST and REPO, under the # CHANGE THESE banner — the only two, and they are wrong until you do. (The .github/ flavour needs nothing: GitHub supplies GITHUB_REPOSITORY and friends.)
server/package.json package name and description
server/core.js the message every accessor throws
server/index.js the trigger, audience, template and rule-group ids — all four are namespaced with your module id, and core refuses them otherwise
server/boot.js the placeholder world name
server/db/schema.sql every table name — the prefix must be your id
server/db/purge.sql the same table names
server/model/worldStatus/worldStatus.db.js the TABLE constant
server/model/clans/clanProvider.db.js the CLANS and MEMBERS table constants
server/model/clans/clanProvider.model.js pageUrlTemplate — it must match the route client/src/entry.jsx registers
server/router/public/world.router.js the #swagger.tags name
server/router/public/clans.router.js the #swagger.tags name
server/swagger/doc.js the tag, and the Examplegame… schema prefix
server/scripts/swaggerFragment.js the generated fragment's info.title
server/test/_fakes.js ctx.moduleId
server/test/entry.test.js the trigger id the world-status test asserts
server/test/worldStatus.test.js the fixture's world name
server/test/clanProvider.test.js the fixture's world name
server/package-lock.json regeneratednpm install --prefix server
client/package.json package name and description
client/vite.config.js the guard plugin's name
client/src/core.js the console tag on the identity check
client/src/shim/rg.js the console tag on the missing-global error
client/src/entry.jsx ID, every route path and nav to, and the three declareModuleSlot names — core enforces that a slot is namespaced under your id
client/src/routes/public/Clans.jsx the link to the clan page
client/src/routes/public/Clan.jsx the three <Slot name> values and their moduleId
client/test/registration.test.js the example path in the comment
client/package-lock.json regeneratednpm install --prefix client
swagger-fragment.json regeneratednpm run swagger --prefix server

That table is checked. scripts/checkRenameSites.js at the root of this kit compares it against the tree on every pull request: a file that still mentions the placeholder and is not listed fails the build, and so does a listed file with nothing left to rename. A checklist nobody verifies is a checklist that is wrong by the second edit.

Two things you do not rename: the mount prefixes /world and /clans need not be your id (the server's prefix namespace is shared with core's — /status, /settings, /version, /contact and /teams are already taken, which is why the clan router is not mounted at the obvious name), and the world / clan naming throughout is ordinary vocabulary you should replace with your own domain's when you replace the feature. clan in particular is the point rather than the placeholder: core's word is Team, yours is whatever your game says, and the provider exists because core cannot pick one.

Licence

GPL-3.0-or-later, like everything else in this project — see LICENSE.md. This directory is meant to be copied and made yours; it carries that licence, and so does anything derived from it.