Closes the long-standing SSE TODO. The previous attempt with
`fastify-sse-v2 ^4` was incompatible with Fastify 5 and was never wired
in; the README/DEPLOYMENT.md kept advertising "real-time log streaming"
that didn't exist. The web client never used EventSource — `web/src/
lib/api.ts` already polls `/deployments/:id/logs` via the normal
`apiRequest` helper.
Resolution: remove the claim, not ship the feature.
- drop `fastify-sse-v2` dep from `backend/package.json` + lockfile
- delete the commented-out plugin import + register in `server.ts`,
replace with a NOTE explaining the JSON-polling decision and how
to add a stream later (`reply.raw`)
- remove the `TODO: Re-enable SSE` comment in `deployments/routes.ts`;
the endpoint already returns JSON, document that explicitly
- rewrite the README "Deployment Log Streaming" section as
"Deployment Logs" (JSON-polled, no SSE); fix the endpoint table
- flip the DEPLOYMENT.md bullet from "Real-time log streaming (SSE)"
to "Deployment log retrieval (JSON polling — no SSE)"
- mark REVIEW_ACTIONS #4 RESOLVED with the reasoning
- tick the roadmap checkbox
If a real-time stream is wanted later, ship it explicitly via
`reply.raw` and update README/DEPLOYMENT.md/the route comment in the
same change. Don't reintroduce a half-disabled plugin.
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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
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