Build on the existing programs.worktrunk module:
- add bash/zsh/fish/nushell shell integrations, enabled by default via
the corresponding home.shell.enable<SHELL>Integration options,
- add an opt-in programs.worktrunk.claudeCodeIntegration, which wires
worktrunk into programs.claude-code: a statusLine, WorktreeCreate/
WorktreeRemove hooks (so agent isolation routes through wt), activity
state-marker hooks (🤖/💬 in wt list), and skills. Of the skills,
/wt-switch-create is on by default while /worktrunk is off by default,
since settings already manages the config it would help edit.
Both integrations need the wt binary, so they are inert when package is
set to null.
Follow-up to #9226, recreating the integration part of #9788.
Assisted-by: Claude-Code:GLM-5.3
