feat: release SDK 1.0 for production Calls and Goal results

[Si40Code]

Summary

• Prepare calle-ai 1.0.0 for the released single-target Calls API.
• Require phone, result schema and a durable idempotency key; support optional region/locale, cancellation before submission, and detailed events.
• Expose Billing call_id, call_outcome, result_status and transcript. Calls and Goal Runs stop waiting when result readiness is final, including null result/error.
• Preserve current main credential redaction, URL-path encoding, packaging protections and MIT license metadata.

Compatibility

This is a breaking Calls migration. Keep SDK 0.7.x for historical legacy call-task IDs; upgrade Goal wait helpers to avoid timeouts on unavailable results. No SDK has been published by this PR.

Verification

• Full scripts/validate.sh: 65 tests, contract/Ruff/mypy/example checks, hygiene, distribution validation and fresh wheel/sdist installation passed.
• New generated Calls get/events/cancel URL path-segment regression coverage passes.
• The OpenAPI paths and components match the deployed production contract.
• Earlier packaged-candidate read-only verification covered 9 existing production Calls and stored webhooks. No new calls were placed in this release preparation; a new live Goal Run creation smoke was not repeated.

Release

Merge after checks and CODEOWNER approval, then publish GitHub Release v1.0.0 from main. The PyPI protected environment requires non-initiator approval. Publish matching TypeScript SDK before deploying the updated public docs.

[Si40Code]

Release preflight note: the existing main branch lockfile pins transitive AnyIO 4.13.0. Dependabot alerts #1 and #2 report affected versions below 4.14.2, including a critical TLS hostname validation advisory. This release keeps the existing dependency constraints/versions; fresh wheel and sdist installation checks resolved AnyIO 4.15.1, but installations reusing older dependency constraints may retain the vulnerable version. This is a pre-existing dependency issue, not addressed by the Calls contract migration. Please review this risk before publication; it is not covered by the green functional CI result.