refactor(prog): six programming-track hygiene fixes from re-review

- prog-lsp.el: rename `cj/lsp--remove-eldoc-provider' →
  `cj/lsp--remove-eldoc-provider-global' and call it once from the
  lsp-mode `:config' block instead of attaching it per-buffer via
  `lsp-managed-mode-hook'.  The previous per-buffer remove with the
  buffer-local flag raced lsp-mode's own population of the local
  hook; removing the provider from the global default before any LSP
  buffer attaches makes the absence stick.  Two existing tests
  updated to the new contract (remove-from-default + idempotent
  re-run).

- prog-webdev.el / prog-python.el: warn at load time when
  `prettier' or `pyright' is missing on PATH via
  `cj/executable-find-or-warn'.  Both modules now `(require
  'system-lib)' to expose the helper.  Missing dependencies surface
  up front instead of mid-edit at first format/LSP attach.

- keyboard-compat.el: document existing idempotence.  The hook
  install uses a named function so `add-hook' deduplicates, and the
  hook body only calls `define-key' (latest binding wins, same
  value) -- adding a comment so future readers don't re-question.

- dev-fkeys.el: add a `typescript' clause to
  `cj/--f6-test-runner-cmd-for'.  F6 now runs `npx --no-install
  vitest <path>' when vitest is on PATH, otherwise `npx --no-install
  jest <path>'.  Updates the matching test from "returns nil" to
  cover both code paths; the impl-level test now asserts the routed
  command instead of expecting a user-error.

- flycheck-config.el: build the LanguageTool wrapper path with
  `(expand-file-name "scripts/languagetool-flycheck"
  user-emacs-directory)' instead of a hardcoded `~/.emacs.d/...'.
  Survives a non-standard `user-emacs-directory'.

- latex-config.el: replace the hardcoded Zathura viewer with
  `cj/--latex-select-pdf-viewer', which walks
  `cj/--latex-pdf-viewer-candidates' (zathura → evince → okular →
  SumatraPDF → xdg-open) and falls back to "PDF Tools" when nothing
  is on PATH.  Each entry maps an executable to the matching
  TeX-view-program-list name so AUCTeX's defaults handle the
  actual viewer invocation.

1 files changed, 13 insertions, 5 deletions

diff --git a/modules/prog-lsp.el b/modules/prog-lsp.el
index e03a475d..045dda24 100644
--- a/modules/prog-lsp.el
+++ b/modules/prog-lsp.el
@@ -48,10 +48,15 @@ Idempotent — `add-to-list' skips patterns already present."
   (dolist (pattern cj/lsp-file-watch-ignored-extras)
     (add-to-list 'lsp-file-watch-ignored-directories pattern)))
 
-(defun cj/lsp--remove-eldoc-provider ()
-  "Remove lsp-mode's provider from `eldoc-documentation-functions' here.
-Buffer-local — the global hook value is untouched."
-  (remove-hook 'eldoc-documentation-functions #'lsp-eldoc-function t))
+(defun cj/lsp--remove-eldoc-provider-global ()
+  "Remove lsp-mode's provider from the global `eldoc-documentation-functions'.
+Run once after lsp-mode loads.  The previous per-buffer removal raced
+lsp's own buffer-local add: the buffer-local remove fired before lsp
+populated the buffer-local hook (lsp inherits the global default and
+mutates from there), so the buffer-local hook ended up holding the
+provider anyway.  Removing globally before lsp ever attaches a buffer
+makes the absence stick for every subsequent lsp-managed buffer."
+  (remove-hook 'eldoc-documentation-functions #'lsp-eldoc-function))
 
 ;;;;; ---------------------------- LSP Mode ---------------------------
 
@@ -73,7 +78,10 @@ Buffer-local — the global hook value is untouched."
   (setq lsp-enable-on-type-formatting nil)
   (setq lsp-signature-auto-activate nil)
   (setq lsp-signature-render-documentation nil)
-  (add-hook 'lsp-managed-mode-hook #'cj/lsp--remove-eldoc-provider)
+  ;; Strip lsp-mode's eldoc provider from the GLOBAL hook value once,
+  ;; not per buffer.  See `cj/lsp--remove-eldoc-provider-global' for
+  ;; why per-buffer racing didn't stick.
+  (cj/lsp--remove-eldoc-provider-global)
   (setq lsp-modeline-code-actions-enable nil)
   (setq lsp-modeline-diagnostics-enable nil)
   (setq lsp-headerline-breadcrumb-enable nil)