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, 6 insertions, 0 deletions

diff --git a/modules/prog-python.el b/modules/prog-python.el
index a4c662e4..5f9a4175 100644
--- a/modules/prog-python.el
+++ b/modules/prog-python.el
@@ -21,6 +21,8 @@
 
 (defvar python-ts-mode-map)
 
+(require 'system-lib)  ; for cj/executable-find-or-warn
+
 ;; Forward declarations for LSP
 (declare-function lsp-deferred "lsp-mode")
 
@@ -38,6 +40,10 @@ Install with: pip install pyright")
   "Path to mypy static type checker.
 Install with: pip install mypy")
 
+;; Warn at load time if pyright is missing rather than waiting for the
+;; first LSP attach to fail with a confusing connection error.
+(cj/executable-find-or-warn pyright-path "pyright LSP" 'prog-python)
+
 ;; -------------------------------- Python Setup -------------------------------
 ;; preferences for Python programming