Anthropic Python SDK 1.2.0 release notes

Full Changelog: v1.1.0...v1.2.0

api: beta files/skills namespaces use GA shapes; drop dated beta header pins (9df4565)

aws,bedrock: sign raw request bytes so binary file uploads work (#531) (f50e910)
ci: resolve assignment aliases in detect-breaking-changes (f2c4925)
sessions: make event accumulator forward-compatible with new event types (#533) (cbbaf6e)
tools: let read return a view_range of a file over the size cap (#538) (b68e876)
tools: preserve exact file bytes in the agent toolset and memory tool (no newline translation) (#540) (56921a8)
webhooks: require headers to be passed to unwrap() (0baa902)

api: clarify pagination on the organization rate-limit list endpoints (1832b27)