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1ef030f162
Problem: Parent commit regressed some behavior of the old C helptags-gen impl: - helpfiles in sub-directories are named by basename, so :help fails - "help-tags" always names "tags", never "tags-nl" - E150 E151 E152 E153 are never reported - existing tags file is not overwritten if no tags were found - a duplicate tag aborts the run, skipping the remaining directories - `*.TXT` and `*.FRX` (uppercase) are not recognized as helpfiles - tree-sitter-vimdoc accepts tags that the C parser rejected: `*a|b*` (breaks |links|) and unterminated `*tag` - PUC Lua "<" compares with (localized) `strcoll()`, so the tags file is not sorted by byte value (E432) - requiring `vim.treesitter` at load time breaks :help itself, not just :helptags, where the module is unavailable - `vim.pack` runs :helptags for plugins that have no "doc/" directory, so every install/update emits E150 Solution: - Fail the build if generating helptags reports any `v:errmsg`. - Restore old behavior: tags generated for runtime/doc are now identical to those from the C implementation. Errors are non-fatal messages instead of exceptions, so all directories are still processed. - Load treesitter lazily, report a plain error if parser is missing.