Remove incorrect PATH setup for OpenCode npm global installation

[Copilot]

OpenCode engine's execution step included PATH manipulation that searched /opt/hostedtoolcache/node for the binary, but npm install -g places packages in npm's global directory which actions/setup-node already adds to PATH.

Changes:

• Removed hostedtoolcache PATH lookup in pkg/workflow/opencode_engine.go (lines 182-184)
• Recompiled affected workflow lock files

Before:

pathSetup := `NODE_BIN_PATH="$(find /opt/hostedtoolcache/node -mindepth 1 -maxdepth 1 -type d | head -1 | xargs basename)/x64/bin" && export PATH="/opt/hostedtoolcache/node/$NODE_BIN_PATH:$PATH"`
opencodeCommand = fmt.Sprintf(`%s && %s`, pathSetup, opencodeCommand)

After:

// Note: No PATH setup needed - actions/setup-node automatically adds npm global bin to PATH

The OpenCode CLI is now invoked directly, relying on the PATH configuration from actions/setup-node@v6.1.0.

Original prompt

Reference: https://github.com/githubnext/gh-aw/actions/runs/21041037209/job/60502640153#step:26:1

Review installation steps for opencode and file path location

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