Fix .juliabundleignore: directory patterns, comments, and content exclusion

[xtalax]

Summary

• Directory patterns (e.g. output-data/) now correctly exclude all files inside the directory, not just the directory entry itself. Previously, Glob.FilenameMatch("output-data/") only matched the literal string and files inside were still bundled.
• Comments (# ...) and blank lines in .juliabundleignore are now properly skipped instead of being compiled into glob patterns.
• File/directory ambiguity fixed: a pattern foo.csv/ no longer incorrectly excludes a file named foo.csv (only matches if it's actually a directory).

Root cause

get_bundleignore passed every line through Glob.FilenameMatch() without filtering. Glob.FilenameMatch("output-data/") matches the literal string "output-data/" but NOT "output-data/foo.jld2" — so files inside ignored directories were silently bundled.

Fix

New _parse_bundleignore_line() classifies each line:

• nothing for comments/blanks (skipped)
• String for plain directory prefixes → matched via startswith
• Glob.FilenameMatch for glob patterns (unchanged behavior)
• Glob-containing directory patterns (e.g. */bar/) emit both the dir match and a pattern* contents match

Test plan

• Existing path_filterer tests updated (removed "known limitation" comments — the limitation is now fixed)
• Existing fixtures/bundle1 integration tests all pass (22/22 including directory exclusion)
• All bundle.* test sets pass (0 failures)

Relates to #130 (negated paths — this PR cleans up the same code path and is a prerequisite).

🤖 Generated with Claude Code

[xtalax]

This is something I came up against a few months ago, claude was able to fix.

The problem was failing to exclude items inside of directories as well as directories.

[pfitzseb]

Do you have a reproducer for the original issue? We have test coverage for this and explicitly check that files in excluded directories are not present in the bundle:

JuliaHub.jl/test/packagebundler.jl

Lines 414 to 437 in dabdf2b

	@testset "directories" begin
	write(
	joinpath(bundle_root, ".juliabundleignore"),
	"""
	output-data/
	foo.csv/
	""",
	)
	files = bundle_and_file_listing(bundle_root)
	@test files == [
	"bundle1/.juliabundleignore",
	"bundle1/Manifest.toml",
	"bundle1/Project.toml",
	"bundle1/dir1/binary.exe",
	"bundle1/dir1/foo.csv",
	"bundle1/foo.csv",
	"bundle1/keys.private",
	"bundle1/script.jl",
	"bundle1/settings.json",
	"bundle1/subignore/keys.private",
	"bundle1/subignore/readme.txt",
	"bundle1/xyz.exe",
	]
	end