chore(release): prepare v0.1.5

[muxx]

What changed

• sync the control-plane OpenAPI snapshot from agentbox/mono commit a7d59d50e3dd84faee59aca08df1b5bb175266e6 (MR !46)
• regenerate clients and reference docs, including the documented 503 response for sandbox creation
• remove obsolete E2B access-token schema filters while keeping internal MCP and catalog contracts out of the public SDK
• bump all JavaScript, Python, and Go packages to 0.1.5

This PR depends on https://gitlab.retailcrm.tech/agentbox/mono/-/merge_requests/46 and must be merged after that MR.

Validation

• make generate
• git diff --check
• node scripts/check-release-versions.mjs v0.1.5
• pnpm install --frozen-lockfile
• uv sync --project packages/python-sdk --frozen
• uv sync --project packages/code-interpreter-python --frozen
• pnpm format:check
• pnpm lint
• pnpm typecheck
• pnpm test
• make go-check

Release artifacts and the KVM runtime suite will be verified before tagging, as required by RELEASING.md.