opencode: drop the misplaced project config

It lived in the orchestrator repo (the parent session's project) and so never
governed the task-tool subagents, which resolve their parent session's directory —
for launcher-started runs that is /srv/cc-ci-orch/cc-ci. The real config now lives
there (cc-ci repo, operator-approved). Extension was never the problem: .jsonc
parsed and resolved fine; the LOCATION was wrong.

opencode.jsonc

@@ -1,15 +0,0 @@
-{
-  "$schema": "https://opencode.ai/config.json",
-  // Model split for cc-ci agent runs (operator decision 2026-08-04):
-  // - The MAIN driving session (upgrader/orchestrator/report) stays on glm-5.2 —
-  //   set via --model at launch (launch-upgrader.py / launch-report.py tier config).
-  // - Every SUBAGENT (the built-in `general` agent used by the task tool) runs on
-  //   DeepSeek V4 Pro via OpenCode ZEN: ~3-5x cheaper per token than glm-5.2 with
-  //   near-free cache hits, which is where the weekly run burns most of its budget.
-  // Project-scoped: applies to opencode sessions started in this directory tree.
-  "agent": {
-    "general": {
-      "model": "opencode/deepseek-v4-pro"
-    }
-  }
-}