Add GLM 5.2 direct and OpenRouter support

[brynary]

Summary

• add GLM 5.2 to the direct Z.AI catalog and make it the Z.AI default
• add z-ai/glm-5.2 to the opt-in OpenRouter catalog
• expose route-appropriate reasoning controls, context limits, caching, and pricing
• decode both reasoning_content and the OpenRouter-normalized reasoning field in the generic OpenAI-compatible codec
• add catalog coverage and a live GLM 5.2 reasoning/tool round-trip regression test

Verification

• live OpenRouter E2E: forced multiply tool call, reasoning capture, tool-result replay to 437, and authoritative cost reporting
• cargo nextest run --locked -p fabro-model -p fabro-llm --no-fail-fast --status-level fail (755 passed)
• cargo +nightly-2026-04-14 clippy --locked -p fabro-model -p fabro-llm --all-targets -- -D warnings
• cargo +nightly-2026-04-14 fmt --check --all
• no pending snapshots

[Copilot]

Pull request overview

Adds GLM 5.2 across Fabro’s model catalog and OpenAI-compatible wire handling, including OpenRouter routing and regression coverage, so GLM 5.2 can be selected (and defaulted for Z.ai) with correct reasoning/tool behavior and authoritative cost reporting.

Changes:

• Add glm-5.2 to the direct Z.ai catalog (set as Z.ai default + new aliases) and add z-ai/glm-5.2 to the opt-in OpenRouter catalog with limits, reasoning controls, caching, and pricing.
• Extend the OpenAI-compatible decoder to accept OpenRouter’s normalized reasoning field in both streaming and non-streaming responses (in addition to reasoning_content).
• Add/extend catalog assertions and add a live OpenRouter E2E regression test for GLM 5.2 reasoning + tool-call round trip + authoritative cost.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
lib/crates/fabro-model/src/catalog/providers/zai.toml	Introduces glm-5.2 as the default Z.ai model with limits/features/controls/costs and adjusts GLM 4.7 aliases accordingly.
lib/crates/fabro-model/src/catalog/providers/openrouter.toml	Adds z-ai/glm-5.2 OpenRouter model entry with limits, reasoning controls, caching, and pricing.
lib/crates/fabro-model/src/catalog.rs	Adds catalog tests/snapshots validating GLM 5.2 presence, defaults/aliases, and OpenRouter opt-in behavior.
lib/crates/fabro-llm/tests/it/wire/openai_compatible.rs	Updates streaming transcript coverage to exercise OpenRouter-style reasoning deltas.
lib/crates/fabro-llm/tests/integration.rs	Adds a live OpenRouter E2E test for GLM 5.2 reasoning + required tool-call + tool-result replay + authoritative costs.
lib/crates/fabro-llm/src/codec/openai_compatible/wire.rs	Extends wire structs to deserialize reasoning, adds helpers, and unit tests for both spellings.
lib/crates/fabro-llm/src/codec/openai_compatible/stream.rs	Uses the unified reasoning accessor when accumulating streamed reasoning deltas.
lib/crates/fabro-llm/src/codec/openai_compatible/response.rs	Uses the unified reasoning accessor when decoding non-streamed responses into Thinking parts.
lib/crates/fabro-llm/src/adapter_registry.rs	Updates the built-in route equivalence table to include glm-5.2.

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[Copilot]

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated no new comments.

[Copilot]

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated 2 comments.

[Copilot]

Pull request overview

Copilot reviewed 9 out of 9 changed files in this pull request and generated no new comments.

[Copilot]

Pull request overview

Copilot reviewed 9 out of 10 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (1)

lib/crates/fabro-llm/src/codec/openai_compatible/wire.rs:201

• reasoning() prefers reasoning_content even when it is an empty string, which can suppress OpenRouter reasoning deltas if both keys are present. Filter out empty strings so the fallback works correctly.

    pub(super) fn reasoning(&self) -> Option<&str> {
        self.reasoning_content
            .as_deref()
            .or(self.reasoning.as_deref())
    }