[gentbot]

• wrktr_init: point the bare repo's HEAD at the chosen main branch instead of an unborn master, and reject an invalid branch name before creating anything.
• wrktr_use: restore the previously loaded session if loading another one fails validation.
• CI: bump actions/checkout to v7.0.1 (Node 24), pinned by SHA.
• Tests: cover the real wrktr_remove path and its prompts through a pty, and set a git identity in the test setup so tests do not depend on the machine's config.

What and why

Changes

Checklist

All PRs

• bats tests/ passes locally
• shellcheck worktree-functions.sh passes locally
• CHANGELOG.md updated (add entry under [Unreleased])

New public functions

• Docblock above function follows the project format
• [ "$1" = "--help" ] && { wrktr_help <name>; return 0; } guard present
• wrktr_validate || return 1 at top (for session-dependent functions)
• Dry-run support: _wrktr_run wraps mutations; _wrktr_is_dryrun gates conditional logic
• Error messages use _wrktr_breaker red "..." (writes to stderr)
• Help entry added to wrktr_help case statement
• Documentation added to docs/wrktr.md function reference
• Row added to Quick reference table in docs/wrktr.md
• Tab completion registered if function takes branch or session names
• Tests added to tests/wrktr.bats (at least one success, one failure)

Behavior changes to existing functions

• Describe whether the change is backwards-compatible
• Existing tests updated to reflect new behavior
• docs/wrktr.md updated if command usage or behavior description changed