init: document-haness 하네스 설계

examples/sources/retry-policy-sources.json

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+{
+  "sources": [
+    {
+      "id": "S1",
+      "title": "Timeouts, retries, and backoff with jitter",
+      "url": "https://aws.amazon.com/builders-library/timeouts-retries-and-backoff-with-jitter/",
+      "publisher": "Amazon Web Services Builders’ Library",
+      "accessed": "2026-07-23",
+      "facts": [
+        "Retries can increase load on a dependency that is already failing.",
+        "Exponential backoff limits retry frequency, and jitter spreads retry timing across clients.",
+        "Retry behavior should be bounded rather than continuing indefinitely."
+      ],
+      "notes": "Use for retry-load, backoff, jitter, and bounded-retry claims."
+    },
+    {
+      "id": "S2",
+      "title": "RFC 9110, HTTP Semantics — Idempotent Methods",
+      "url": "https://datatracker.ietf.org/doc/html/rfc9110#section-9.2.2",
+      "publisher": "IETF",
+      "accessed": "2026-07-23",
+      "facts": [
+        "A request method is idempotent when multiple identical requests have the same intended effect as one request.",
+        "A client can automatically retry an idempotent request after a communication failure before reading the response, subject to the specification's conditions."
+      ],
+      "notes": "Use for the definition and retry implications of HTTP method idempotency."
+    },
+    {
+      "id": "S3",
+      "title": "Retry strategy",
+      "url": "https://cloud.google.com/storage/docs/retry-strategy",
+      "publisher": "Google Cloud",
+      "accessed": "2026-07-23",
+      "facts": [
+        "Retry behavior should consider whether the operation is idempotent.",
+        "Exponential backoff increases the delay between retry attempts and should use bounded limits."
+      ],
+      "notes": "Use as a second implementation-oriented source for bounded backoff and idempotency checks."
+    }
+  ]
+}