[audit] fix: foldmethod "indent" → "expr" to activate treesitter folding

[stanfish06]

What

lua/config/options.lua:100 sets foldmethod = "indent" but the very next line configures a treesitter foldexpr. Because Neovim only evaluates foldexpr when foldmethod = "expr", the treesitter fold expression has been silently dead — folding was indent-based all along.

-- before
vim.o.foldmethod = "indent"
vim.o.foldexpr   = "v:lua.vim.treesitter.foldexpr()"  -- never evaluated

-- after
vim.o.foldmethod = "expr"
vim.o.foldexpr   = "v:lua.vim.treesitter.foldexpr()"  -- now active

Where

lua/config/options.lua:100

Why it matters

With foldmethod = "indent", folds are purely whitespace-based and have no awareness of language syntax — mismatched indentation (e.g. Python docstrings, closing braces) creates wrong fold boundaries. foldmethod = "expr" with vim.treesitter.foldexpr() uses the AST for correct, language-aware fold boundaries.

foldlevel = 10 is already set, so switching to "expr" will not collapse any currently-open folds — behaviour is identical on startup, but :set foldmethod? will now report expr and zc/za will fold on correct AST boundaries.

Note on foldnestmax

foldnestmax only applies to indent and syntax methods; it is silently ignored by expr. The existing vim.o.foldnestmax = 10 line becomes a harmless no-op after this change.

Recommended action

Merge. One-line change, zero risk of breaking existing open-fold behaviour.

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