supabase / cli / 28097812821
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fix(stack): retry edge function cold-start to avoid first-request 502 (#5677)

## What

Add a bounded, transport-level retry to the local API proxy's
`/functions/v1/*` route so the first request to an Edge Function does
not surface as a `502 Bad Gateway` while edge-runtime cold-boots its
user worker.

## Why

The proxy forwarded function requests to edge-runtime with no retry,
mapping any transport `HttpClientError` straight to a 502. Edge
functions cold-boot lazily: the first request to a function makes
edge-runtime spin up a user worker, and the connection can be
refused/reset during that window. The runtime's `/_internal/health`
probe answers immediately, so the stack reporting `edge-runtime:
Healthy` does **not** mean a given function is servable yet. The result
is an intermittent one-off 502 on a user's first call — and the same
race made the `packages/stack` edge-function e2e test flaky.

## How

- New `retryColdStart` option on the proxy handler, enabled only on the
functions route (other routes proxy to already-warm services and are
unchanged).
- Retries only transient `TransportError`s, spaced 250ms, bounded to 8
attempts (~2s ceiling).
- Buffers the request body into memory on that route so the request can
be safely re-sent across attempts; a body-read failure returns a 502
instead.

Covered by new `ApiProxy.unit.test.ts` cases: the functions route
retries a reset connection to success, non-functions routes do **not**
retry, and the buffered body is replayed on retry (the last test fails
if the body is streamed instead of buffered).

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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