refactor(ai-vterm): rename Claude-specific names to a generic "agent"

I may add other terminal agents to this launcher (aider, an open-source LLM TUI), so the buffer prefix, the user knob, and the internal helpers shouldn't say "Claude". The module name (ai-vterm) and the `cj/ai-vterm-*` customs were already generic. This finishes the job:

- buffer prefix `claude [<basename>]` -> `agent [<basename>]` (the `defconst` and the matching display-buffer-alist regex move together)
- `cj/ai-vterm-claude-command` -> `cj/ai-vterm-agent-command` (the default still runs the `claude` CLI, with a docstring note on swapping it)
- `cj/--ai-vterm-claude-buffers` / `-displayed-claude-window` / `-reuse-existing-claude` -> `-agent-*`, and their test files renamed to match
- prose in the module commentary and docstrings, plus the matching test docstrings and buffer-name literals

`vterm-config.el` hardcodes the same buffer prefix in `cj/--vterm-toggle-buffer-p` (F12 excludes agent buffers from its candidate set), so that literal moved too. Collapsing it into the shared `cj/--ai-vterm-name-prefix` is a cleanup for another day.

After a reload, a project's buffer opens as `agent [foo]` instead of `claude [foo]`. Old buffers keep their names until killed. I also corrected two stale `eshell-vterm-config.el` references in ai-vterm.el docstrings (that module was split into `vterm-config.el`).

Two things keep saying "Claude": the `cj/ai-vterm-agent-command` default value (the actual CLI), and the "Claude Code" example in `vterm-config.el`'s cursor-restore docstring (a concrete TUI example, not branding).

90 tests pass. `make validate-modules` clean.

1 files changed, 18 insertions, 18 deletions

diff --git a/tests/test-vterm-toggle--buffer-filter.el b/tests/test-vterm-toggle--buffer-filter.el
index 82afe756..d6fd2c8c 100644
--- a/tests/test-vterm-toggle--buffer-filter.el
+++ b/tests/test-vterm-toggle--buffer-filter.el
@@ -4,8 +4,8 @@
 ;; Three closely-related helpers determine which vterm buffers F12
 ;; manages: the predicate `cj/--vterm-toggle-buffer-p', the MRU list
 ;; `cj/--vterm-toggle-buffers', and the per-frame window finder
-;; `cj/--vterm-toggle-displayed-window'.  All three exclude claude-
-;; prefixed buffers so claude has its own F9 surface.
+;; `cj/--vterm-toggle-displayed-window'.  All three exclude agent-
+;; prefixed buffers so agent has its own F9 surface.
 
 ;;; Code:
 
@@ -17,22 +17,22 @@
 (require 'testutil-vterm-buffers)
 
 (defun test-vterm-toggle--cleanup ()
-  "Kill leftover claude- and *test-vterm- prefixed buffers."
-  (cj/test--kill-claude-buffers)
+  "Kill leftover agent- and *test-vterm- prefixed buffers."
+  (cj/test--kill-agent-buffers)
   (cj/test--kill-test-vterm-buffers))
 
 (ert-deftest test-vterm-toggle--buffer-p-accepts-vterm-mode ()
-  "Normal: a vterm-mode buffer with non-claude name qualifies."
+  "Normal: a vterm-mode buffer with non-agent name qualifies."
   (test-vterm-toggle--cleanup)
   (let ((buf (cj/test--make-fake-vterm-buffer "*test-vterm-1*")))
     (unwind-protect
         (should (cj/--vterm-toggle-buffer-p buf))
       (kill-buffer buf))))
 
-(ert-deftest test-vterm-toggle--buffer-p-rejects-claude ()
-  "Boundary: claude-prefixed vterm buffers are excluded from F12's set."
+(ert-deftest test-vterm-toggle--buffer-p-rejects-agent ()
+  "Boundary: agent-prefixed vterm buffers are excluded from F12's set."
   (test-vterm-toggle--cleanup)
-  (let ((buf (cj/test--make-fake-vterm-buffer "claude [project-a]")))
+  (let ((buf (cj/test--make-fake-vterm-buffer "agent [project-a]")))
     (unwind-protect
         (should-not (cj/--vterm-toggle-buffer-p buf))
       (kill-buffer buf))))
@@ -52,17 +52,17 @@
     (kill-buffer buf)
     (should-not (cj/--vterm-toggle-buffer-p buf))))
 
-(ert-deftest test-vterm-toggle--buffers-filters-claude ()
-  "Normal: returns vterm buffers but excludes claude-prefixed ones."
+(ert-deftest test-vterm-toggle--buffers-filters-agent ()
+  "Normal: returns vterm buffers but excludes agent-prefixed ones."
   (test-vterm-toggle--cleanup)
   (let ((normal (cj/test--make-fake-vterm-buffer "*test-vterm-normal*"))
-        (claude (cj/test--make-fake-vterm-buffer "claude [for-test]")))
+        (agent (cj/test--make-fake-vterm-buffer "agent [for-test]")))
     (unwind-protect
         (let ((result (cj/--vterm-toggle-buffers)))
           (should (memq normal result))
-          (should-not (memq claude result)))
+          (should-not (memq agent result)))
       (kill-buffer normal)
-      (kill-buffer claude))))
+      (kill-buffer agent))))
 
 (ert-deftest test-vterm-toggle--displayed-window-finds-vterm ()
   "Normal: vterm in a window -> returns that window."
@@ -78,17 +78,17 @@
               (should (eq (window-buffer result) vt)))))
       (kill-buffer vt))))
 
-(ert-deftest test-vterm-toggle--displayed-window-skips-claude ()
-  "Boundary: only a claude vterm is displayed -> nil (claude not F12-managed)."
+(ert-deftest test-vterm-toggle--displayed-window-skips-agent ()
+  "Boundary: only an agent vterm is displayed -> nil (agent not F12-managed)."
   (test-vterm-toggle--cleanup)
-  (let ((claude (cj/test--make-fake-vterm-buffer "claude [skip-test]")))
+  (let ((agent (cj/test--make-fake-vterm-buffer "agent [skip-test]")))
     (unwind-protect
         (save-window-excursion
           (delete-other-windows)
           (let ((win (split-window-right)))
-            (set-window-buffer win claude)
+            (set-window-buffer win agent)
             (should-not (cj/--vterm-toggle-displayed-window))))
-      (kill-buffer claude))))
+      (kill-buffer agent))))
 
 (provide 'test-vterm-toggle--buffer-filter)
 ;;; test-vterm-toggle--buffer-filter.el ends here