opencode: register four additional Go catalog models

[mulfyx]

Summary

• Register four additional OpenCode Go catalog IDs:
  • glm-5 and kimi-k2.5 through Chat Completions
  • qwen3.8-max and qwen3.5-plus through Anthropic Messages
• Advertise both bare and opencode-go/... forms for each model.
• Add table-driven regression coverage for model resolution, advertisement, and
  endpoint selection.
• Document that a catalog model can be registered after direct protocol
  verification even when the current Go endpoint table omits it.

Motivation

OpenCode Go's public /models endpoint
currently returns all four IDs.

qwen3.8-max is also listed in OpenCode's current
Go endpoint table
as a /messages model. It was added upstream in
anomalyco/opencode#40228
after CCP's original OpenCode Go provider PR
was merged.

The current Go endpoint table omits the other three IDs, so their transports are
not inferred from /models. Their endpoint assignments were verified directly
against the live Go API:

• glm-5 -> /chat/completions
• kimi-k2.5 -> /chat/completions
• qwen3.5-plus -> /messages

Those assignments also match OpenCode's current
Zen endpoint table.
OpenCode previously published glm-5 and kimi-k2.5 in its
Go documentation,
and qwen3.5-plus in a later
Go catalog update.

The proxy catalog remains static: an ID returned by /models is still rejected
unless its generation endpoint has been documented or verified.

Verification

• cargo fmt --all -- --check
• cargo clippy --all-targets -- -D warnings
• cargo test --offline --all-targets: 956 passed, 0 failed
• release Docker build
• public Go /models contains all four IDs
• live proxy generation:
  • glm-5: buffered, HTTP 200, end_turn
  • kimi-k2.5: streaming, HTTP 200, message_stop
  • qwen3.8-max: buffered, HTTP 200, end_turn
  • qwen3.5-plus: streaming, HTTP 200, message_stop

[raine]

Cheers