fix(nvim): work around R.nvim cwd change on rout parser build failure

[michaelbarton]

Problem

R.nvim's check_rout_parser() function changes directory into resources/tree-sitter-rout/ to build the rout tree-sitter parser. When the build fails, early return statements skip the chdir(cwdir) restore call, leaving nvim stuck in the plugin directory for the rest of the session -- breaking :pwd, file saves, and any workflow that depends on cwd.

The build fails because the tree-sitter-rout submodule gitlink is absent from older pinned commits of R.nvim, so grammar.js is never present.

Upstream bug: R-nvim/R.nvim#466 (fix branch exists, not yet merged to main as of 2026-02-27)

Changes

• nvim/lua/plugins/language.lua: adds a lazy.nvim build function for R.nvim that clones tree-sitter-rout directly if grammar.js is missing, so the parser build succeeds and cwd is properly restored
• ansible/tasks/neovim.yml: adds a provisioning task that does the same clone for fresh machine setup; idempotent via grammar.js existence check
• Makefile: adds nvim-check target that boots nvim headlessly across R/py/lua/md filetypes, captures :messages, and fails on any startup errors or warnings; wired into all:

Both workarounds include TODO markers with the upstream issue URL to remove once R-nvim/R.nvim#466 is merged and R.nvim is updated past the fix commit.

Removal criteria

Once R-nvim/R.nvim#466 is merged to R.nvim main:

1. Run :Lazy update R.nvim to advance past the fix commit
2. Delete the build block in nvim/lua/plugins/language.lua and the Ansible task
3. Run make nvim-check -- confirm PASS [R]: clean startup

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