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, 0 insertions, 60 deletions

diff --git a/tests/test-ai-vterm--displayed-claude-window.el b/tests/test-ai-vterm--displayed-claude-window.el
deleted file mode 100644
index 9f84f87b..00000000
--- a/tests/test-ai-vterm--displayed-claude-window.el
+++ /dev/null
@@ -1,60 +0,0 @@
-;;; test-ai-vterm--displayed-claude-window.el --- Tests for the displayed-window helper -*- lexical-binding: t; -*-
-
-;;; Commentary:
-;; The helper returns a window in the selected frame whose buffer
-;; satisfies `cj/--ai-vterm-buffer-p', or nil when no such window
-;; exists.  Used by F9 dispatch and M-F9 in-place replacement.
-
-;;; Code:
-
-(require 'ert)
-
-(add-to-list 'load-path (expand-file-name "modules" user-emacs-directory))
-(add-to-list 'load-path (expand-file-name "tests" user-emacs-directory))
-(require 'ai-vterm)
-(require 'testutil-vterm-buffers)
-
-(ert-deftest test-ai-vterm--displayed-claude-window-no-buffers-returns-nil ()
-  "Boundary: no claude buffers anywhere -> nil."
-  (cj/test--kill-claude-buffers)
-  (save-window-excursion
-    (delete-other-windows)
-    (should-not (cj/--ai-vterm-displayed-claude-window))))
-
-(ert-deftest test-ai-vterm--displayed-claude-window-not-displayed-returns-nil ()
-  "Boundary: claude buffer exists but not in any window -> nil."
-  (cj/test--kill-claude-buffers)
-  (let ((b1 (get-buffer-create "claude [hidden]")))
-    (unwind-protect
-        (save-window-excursion
-          (delete-other-windows)
-          (should-not (cj/--ai-vterm-displayed-claude-window)))
-      (kill-buffer b1))))
-
-(ert-deftest test-ai-vterm--displayed-claude-window-returns-window-when-displayed ()
-  "Normal: claude buffer in a window -> returns that window."
-  (cj/test--kill-claude-buffers)
-  (let ((b1 (get-buffer-create "claude [shown]")))
-    (unwind-protect
-        (save-window-excursion
-          (delete-other-windows)
-          (let ((win (split-window-right)))
-            (set-window-buffer win b1)
-            (let ((result (cj/--ai-vterm-displayed-claude-window)))
-              (should (windowp result))
-              (should (eq (window-buffer result) b1)))))
-      (kill-buffer b1))))
-
-(ert-deftest test-ai-vterm--displayed-claude-window-ignores-non-claude-windows ()
-  "Boundary: only a non-claude buffer is displayed -> nil."
-  (cj/test--kill-claude-buffers)
-  (let ((other (get-buffer-create "regular-displayed-buffer")))
-    (unwind-protect
-        (save-window-excursion
-          (delete-other-windows)
-          (set-window-buffer (selected-window) other)
-          (should-not (cj/--ai-vterm-displayed-claude-window)))
-      (kill-buffer other))))
-
-(provide 'test-ai-vterm--displayed-claude-window)
-;;; test-ai-vterm--displayed-claude-window.el ends here