chore(dotfiles): drop ai-tooling refs from common/, plus minor drift

I removed the `ai-assistants` tmux launcher and the `.claude/settings.local.json` permissions stub from the stowed common dotfiles. The two `aliases.sh` files (bash and zsh) each lost a matching 5-line comment block about the Claude `ai` launcher. None of these belong in a shared dotfile tree.

Two small adjacent updates landed in the same commit. The gitconfig `includeIf` path moved from `~/code/deepsat/` to `~/projects/work/deepsat/code/` to match the on-disk layout. Qalculate auto-saved its config version bump from 5.9.0 to 5.10.0.

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