Martin Tranberg 0dfef3e611 feat: task 9 — add _graph_request helper with retry on 429/503 ...

Add module-level _graph_request() that wraps requests.request() with:
- Up to 3 retries on HTTP 429 (rate limited) and 503 (unavailable)
- Exponential backoff capped at 60 s, honouring Retry-After header
- Default timeout=30 s injected via setdefault (caller can override)

Wire all 13 retry-eligible API calls through _graph_request(). The 3
file-upload requests.put(data=f) calls are kept direct since an open
stream cannot be re-read after the first attempt.

Add 9 unit tests covering: success path, 429/503 retry, Retry-After
header, max-retry exhaustion, timeout injection and override.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-04-12 10:29:39 +02:00

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