Add a bundle-local test suite (currently only verified from consuming apps)

[schmunk42]

This repository has phpunit in require-dev but no test infrastructure, so
every feature is currently verified from a consuming application. Two features
merged (or in review) as #12 and #13 made that gap concrete: their most fragile
parts are pure bundle logic, and the tests that cover them today live in another
repository.

What a bundle-local suite should cover first, in rough priority order:

External worker (#12)

1. ExternalWorkerRunner decisions — success reports complete, a throwing
   handler reports fail with the exception message and no explicit retries
   (the engine keeps its policy), an unhandled topic reports unacquire and is
   not counted as processed, and held job ids are released on shutdown.
2. ExternalWorkerHandlerRegistry — topic-to-handler mapping, and a topic
   claimed by two handlers failing loudly at resolution instead of first-match-wins.
3. ExternalWorkerJob::fromApi() — flattening {name,type,value} variables into
   a name => value map, missing/empty variables, unknown fields.
4. ExternalWorkerOutcome factories and the payload each one produces
   (especially: only what the caller decided is sent).
5. The acquire payload shape: lockDuration passed through as an ISO-8601
   duration string, numberOfTasks honouring the batch size.

Event registry (#13)

6. createEventDeployment() builds the request the engine actually wants —
   metadata on the query string as deploymentName/category/tenantId, not
   as multipart parts, file part named file with its extension preserved. Most
   fragile piece of that feature; regressing it back to the DMN shape is silent.
7. The .event/.channel extension gate rejecting .bpmn20.xml, .dmn and
   especially .bar/.zip (the plausible-but-wrong case).
8. FlowEventInstance/create.input.json really requiring one event and one
   channel reference, rejecting an array/scalar eventPayload, and the REST
   operation and flowable:events:instances:create rejecting identically — one
   schema, two consumers.

Cross-cutting

9. Provider query mapping: listQuery() whitelists, per-resource defaultSort,
   and relationFilters() turning both an IRI and a bare id into the engine's id
   field.
10. Path prefixes staying /service (process engine) vs. /dmn-api vs.
    /external-job-api vs. /event-registry-api/… — the
    base_url-without-/service gotcha applies per engine.
11. Operation names resolving to their input schema. A concrete regression this
    would have caught: flow_external_worker_job_bpmn_error resolved to
    FlowExternalWorkerJobBpmn/error.input.json (the resolver splits at the last
    underscore) and the operation shipped without a documented request body.

Most of this needs no engine: a MockHttpClient for the client, plain unit tests
for the worker core, and a Symfony kernel test for the DI wiring
(registerForAutoconfiguration of ExternalWorkerHandlerInterface, the tagged
registry, the input-schema resolver chain). Only an end-to-end event-correlation
test would want a real flowable-rest service.

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