Install jj and opencode by default and remove conflict x from fish prompt

[kdeal]

I basically always use jj and use opencode most of the time, so install them by default. The in prompt conflict marker wasn't working correctly and I don't think I really need it, so I am just removing it.

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Reviewing files that changed from the base of the PR and between a5cc4bc and ea17dfb.

📒 Files selected for processing (2)

• xdg_config/fish/functions/devenv.fish
• xdg_config/fish/functions/fish_jj_prompt.fish

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Keep base devenv independent of npm

When npm is not already installed, adding opencode to the unconditional package list makes every devenv run fail even for base, lua, python, and rust environments after the other tools install. opencode is configured as an npm_global command in xdg_config/cmd_install/config.toml, and cmd-install returns False/exits non-zero when npm is unavailable (bin/cmd-install lines 628-633), so fresh hosts without Node now get a failed environment setup from this default.

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