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, 15 insertions, 14 deletions

diff --git a/tests/test-prog-lsp--add-file-watch-ignored-extras.el b/tests/test-prog-lsp--add-file-watch-ignored-extras.el
index 142cd2ea..9b71cab8 100644
--- a/tests/test-prog-lsp--add-file-watch-ignored-extras.el
+++ b/tests/test-prog-lsp--add-file-watch-ignored-extras.el
@@ -87,23 +87,24 @@
     (should-error (cj/lsp--add-file-watch-ignored-extras)
                   :type 'wrong-type-argument)))
 
-(ert-deftest test-prog-lsp--remove-eldoc-provider-removes-lsp-provider-locally ()
-  "Normal: remove lsp-mode's Eldoc provider from the buffer-local hook."
-  (with-temp-buffer
-    (setq-local eldoc-documentation-functions
-                '(lsp-eldoc-function eldoc-documentation-default))
-    (cj/lsp--remove-eldoc-provider)
+(ert-deftest test-prog-lsp--remove-eldoc-provider-global-removes-from-default ()
+  "Normal: remove lsp-mode's Eldoc provider from the global hook value.
+The per-buffer removal that this replaced raced lsp-mode's own buffer-
+local hook population; removing globally before any LSP buffer attaches
+makes the absence stick for every subsequent lsp-managed buffer."
+  (let ((eldoc-documentation-functions
+         '(lsp-eldoc-function eldoc-documentation-default)))
+    (cj/lsp--remove-eldoc-provider-global)
     (should-not (memq #'lsp-eldoc-function eldoc-documentation-functions))
     (should (memq 'eldoc-documentation-default eldoc-documentation-functions))))
 
-(ert-deftest test-prog-lsp--remove-eldoc-provider-does-not-touch-default-value ()
-  "Boundary: removing the LSP provider in one buffer leaves the default hook alone."
-  (let ((eldoc-documentation-functions '(lsp-eldoc-function)))
-    (with-temp-buffer
-      (setq-local eldoc-documentation-functions '(lsp-eldoc-function))
-      (cj/lsp--remove-eldoc-provider)
-      (should-not (memq #'lsp-eldoc-function eldoc-documentation-functions)))
-    (should (memq #'lsp-eldoc-function eldoc-documentation-functions))))
+(ert-deftest test-prog-lsp--remove-eldoc-provider-global-is-idempotent ()
+  "Boundary: re-running the removal after the provider is gone is a no-op."
+  (let ((eldoc-documentation-functions '(eldoc-documentation-default)))
+    (cj/lsp--remove-eldoc-provider-global)
+    (cj/lsp--remove-eldoc-provider-global)
+    (should (equal eldoc-documentation-functions
+                   '(eldoc-documentation-default)))))
 
 (ert-deftest test-prog-lsp--module-no-obsolete-lsp-eldoc-hook-reference ()
   "Regression: prog-lsp should not reference obsolete `lsp-eldoc-hook'."