Example gallery: full runnable reference applications (CI-tested)

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Motivation

The existing quickstarts are CI-tested and good; what's missing is the next step — full reference applications showing Awa embedded in the frameworks people actually run, exercising the integration seams (bridges, callbacks, mixed fleets) that quickstarts can't.

Scope

CI-tested reference apps under examples/, one directory each:

• FastAPI + Awa — transactional enqueue via awa.bridge.insert_job, a user-owned callback endpoint (feat(callbacks): callback-only router + user-owned helpers (#279, #281) #293 pattern), progress polling.
• Django (sync) — insert_job_sync inside a request transaction, Client sync worker.
• axum + SeaORM — awa-seaorm transactional enqueue alongside application writes.
• Serverless tick() — the Serverless-friendly dispatch: tick() endpoint for zero-infrastructure deployments #118 shape driven by a cron trigger, HttpWorker execution.
• Mixed pipeline — Rust producer enqueuing for a Python ML worker on the same queue, with a follow-up job (ADR-029) and an A→B dependency once Job dependencies: run job B only after job A completes #14 lands.

Each app: docker-compose for Postgres, a README that doubles as a tutorial, and a smoke test in CI (same convention as the quickstarts).

Acceptance

• All apps green in CI; each README walks from clone to observed job completion.
• Linked from the docs-site Learn section and the relevant feature docs.

References

Roadmap: docs/0.7-roadmap.md (WS-6, NEW-16). Related: #118, #14, #293, ADR-029, awa-seaorm.