chore: switch port model to Claude Opus latest

OPENCODE_MODEL repo variable updated to openrouter/~anthropic/claude-opus-latest
to match; contract frontmatter, port.env.example, PORTING.md, and the workflow
comment all now reference the same alias.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: LukasParke

.github/workflows/upstreamer-port.yaml

@@ -55,7 +55,7 @@ jobs:
         env:
           # Provide these in repo settings:
           #   Secret   OPENROUTER_API_KEY  — sk-or-... key opencode uses for inference
-          #   Variable OPENCODE_MODEL      — e.g. openrouter/~anthropic/claude-sonnet-latest
+          #   Variable OPENCODE_MODEL      — e.g. openrouter/~anthropic/claude-opus-latest
           OPENROUTER_API_KEY: ${{ secrets.OPENROUTER_API_KEY }}
           OPENCODE_MODEL: ${{ vars.OPENCODE_MODEL }}
           UPSTREAMER_TIMEOUT_SECONDS: 7200

.upstreamer/port.env.example

@@ -17,7 +17,7 @@ OPENROUTER_API_KEY=
 #
 # This is a load-bearing SDK port with a strict parity eval — use a strong coding
 # model. Suggested starting point:
-OPENCODE_MODEL=openrouter/~anthropic/claude-sonnet-latest
+OPENCODE_MODEL=openrouter/~anthropic/claude-opus-latest
 
 # Optional: hard wall-clock cap for one run, in seconds. A full-surface
 # reconciliation is much slower than an incremental delta port.

.upstreamer/upstreamer.md

@@ -1,7 +1,7 @@
 ---
 upstream: OpenRouterTeam/typescript-agent
 downstream: OpenRouterTeam/python-agent
-model: openrouter/~anthropic/claude-sonnet-latest
+model: openrouter/~anthropic/claude-opus-latest
 ---
 
 # Python Port Contract — `@openrouter/agent` → `openrouter-agent`

PORTING.md

@@ -96,7 +96,7 @@ Two values, same names locally and in CI:
 | Name | Where | What |
 |------|-------|------|
 | `OPENROUTER_API_KEY` | local: `.upstreamer/port.env` · CI: repo **secret** | `sk-or-…` key opencode uses for inference |
-| `OPENCODE_MODEL` | local: `.upstreamer/port.env` · CI: repo **variable** | e.g. `openrouter/~anthropic/claude-sonnet-latest` |
+| `OPENCODE_MODEL` | local: `.upstreamer/port.env` · CI: repo **variable** | e.g. `openrouter/~anthropic/claude-opus-latest` |
 
 The wrapper writes the key into `~/.local/share/opencode/auth.json` so headless
 runs work without the interactive `opencode /connect` flow.