feat(graphql): add deferred project header delivery

[mikeldking]

Summary

• enable Strawberry incremental execution for GraphQL queries
• add Relay multipart response handling so query @defer payloads can stream into the client
• move project header cost, latency, and summary-name data onto deferred fragments so the header shell can render before slow secondary fields
• add Relay schema extensions and generated artifacts required for @defer
• pin graphql-core to the 3.3 prerelease line required by incremental execution and update uv.lock
• keep project header annotation summary names refreshed after annotation deletes

Verification

• regenerated Relay artifacts with the local Relay compiler
• uv run python - <<'PY'\nimport graphql\nprint(graphql.__version__)\nPY
• uv run python - <<'PY'\nfrom phoenix.server.api.schema import build_graphql_schema\nbuild_graphql_schema()\nprint('schema-ok')\nPY
• full frontend tsc / test runs were not available in this workspace because the local package binaries were not fully linked

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Project	Status	Preview	Updated (UTC)
arize-phoenix	🟢 Ready	View Preview	Mar 26, 2026, 11:47 PM

[claude]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.