Add Future AGI SDK compliance workflow

[nik13]

Summary

• Runs SDK CI on every PR and push to dev/main.
• Adds Python and TypeScript SDK test/compliance checks through the shared harness.
• Adds generated Go and Java SDK build checks.
• Adds release-sdks.yml to publish/release SDK packages on merge to main.
• Allows SDK generation scripts to consume an explicit backend OpenAPI path for backend compatibility jobs.

Release setup

• Python publishing uses PyPI Trusted Publishing via pypa/gh-action-pypi-publish.
• TypeScript publishing uses NPM_TOKEN and skips existing package versions.
• Go release creates go/futureagi/v<version> module tags.
• Java release deploys to GitHub Packages and skips existing versions.

Validation

• actionlint .github/workflows/sdk-compliance.yml .github/workflows/release-sdks.yml
• YAML parse for both workflows
• git diff --check
• Fresh TypeScript SDK install/typecheck/tests/build
• Go SDK tests
• PR checks are green for Python tests, TypeScript tests, Go/Java builds, and both compliance suites.

Enforcement

• Branch protection now requires the SDK checks on futureagi-sdk dev and main.
• Companion backend gate: [codex] Add backend SDK compatibility gate future-agi#771