chore(gitignore): match node_modules as a symlink too

[yakimoto]

chore(gitignore): match node_modules as a symlink too, not only as a directory

node_modules/ with a trailing slash matches a DIRECTORY only. The documented
one-agent-one-worktree drill LINKS rather than copies
(ln -s "$PWD/node_modules" /tmp/<lane>/node_modules), and git treats a symlink as a FILE -- so the
pattern never matched it and every worktree carried a permanent ?? node_modules.

Dropping the trailing slash matches both forms. Proven with git check-ignore against a symlink
probe before the sweep ran:

pattern 'node_modules/'   -> symlink NOT ignored
pattern '/node_modules/'  -> symlink NOT ignored
pattern 'node_modules'    -> symlink IGNORED, and a real directory still IGNORED

So nothing that was ignored stops being ignored -- the change has no behavioural blast radius.

One of 98 identical fleet edits. Refs wave-av/wave-context#124.

Verified after merge by re-fetching the committed bytes from the default branch.

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Summary by cubic

Make .gitignore ignore node_modules whether it’s a directory or a symlink, so symlinked worktrees stop showing ?? node_modules. This drops the trailing slash so Git matches both forms without affecting other ignores.

^{Written for commit e39944f. Summary will update on new commits.}

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