Add Wardwright provider adapter docs

[bglusman]

Summary

• add Wardwright as a named OpenAI-compatible provider adapter kind over the shared HTTP core
• preserve provider response extensions and copy Wardwright receipt IDs into gateway telemetry
• mark Calciforge in-process alloys, cascades, and dispatchers as legacy compatibility, with docs pointing new synthetic-model work to Wardwright

Validation

• cargo test -p calciforge wardwright
• cargo test -p calciforge proxy::telemetry
• cargo test -p calciforge proxy::gateway_tests
• cargo test -p calciforge config::validator
• ruby scripts/check-docs-site.rb
• git diff --check
• pre-commit hook: rustfmt, clippy -D warnings, gitleaks
• pre-push hook: full workspace unit tests, loom tests, doctests

[Copilot]

Pull request overview

Adds Wardwright as a named OpenAI-compatible provider adapter kind over Calciforge’s shared HTTP core, and updates docs/telemetry so Wardwright route receipts can be preserved and surfaced for operators while keeping legacy in-process synthetic selectors available for existing installs.

Changes:

• Document Wardwright as the preferred path for new synthetic-model composition (alloys/cascades/dispatchers now described as legacy compatibility).
• Extend OpenAI chat completion response handling to preserve provider-specific response extensions (via a flattened extra_body map).
• Emit Wardwright receipt IDs in gateway attempt telemetry (log + OTLP attrs) and validate that legacy synthetic selectors produce a migration warning.

Reviewed changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
README.md	Updates gateway feature description and points new synthetic-model work to Wardwright.
docs/model-gateway.md	Adds Wardwright to provider-adapter docs and marks alloys/cascades/dispatchers as legacy compatibility.
docs/index.md	Notes legacy status of in-process synthetic selectors and points to Wardwright.
docs/adr/0002-provider-adapter-boundary.md	Documents Wardwright within the provider-adapter boundary decision and migration guidance.
docs/adr/0001-model-gateway-and-agent-boundaries.md	Adds Wardwright to the supported backend set and records the migration note.
crates/calciforge/src/proxy/openai.rs	Preserves unknown provider response fields and exposes Wardwright receipt extraction helper.
crates/calciforge/src/proxy/openai_streaming.rs	Initializes the new response extension map for streamed responses.
crates/calciforge/src/proxy/handlers.rs	Copies Wardwright receipt IDs into gateway attempt telemetry on successful calls.
crates/calciforge/src/proxy/telemetry.rs	Adds receipt_id to gateway attempt telemetry events (logs + OTLP attrs) and updates tests.
crates/calciforge/src/proxy/telemetry_tests.rs	Verifies provider-specific response extensions reach clients and receipt IDs reach telemetry.
crates/calciforge/src/proxy/gateway.rs	Adds GatewayType::Wardwright metadata/capabilities and shares the existing HTTP core.
crates/calciforge/src/proxy/gateway_tests.rs	Adds parsing/display/core-sharing + metadata assertions for Wardwright.
crates/calciforge/src/proxy/routing.rs	Adds a routing test asserting Wardwright uses the shared HTTP core and metadata.
crates/calciforge/src/proxy/mod.rs	Wires Wardwright into backend type parsing/headers and supported backend lists.
crates/calciforge/src/proxy/backend.rs	Updates mock response construction for the extended response type.
crates/calciforge/src/config.rs	Marks synthetic selector config sections as legacy and adds Wardwright to provider-kind docs.
crates/calciforge/src/config/validator.rs	Adds a config warning when legacy synthetic selectors are present.
crates/calciforge/src/config/validator_tests_3.rs	Adds coverage for the Wardwright allowlist and the legacy-selector warning behavior.

[Copilot]

Pull request overview

Copilot reviewed 21 out of 21 changed files in this pull request and generated 1 comment.