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, 59 deletions

diff --git a/tests/test-ai-vterm--claude-buffers.el b/tests/test-ai-vterm--claude-buffers.el
deleted file mode 100644
index f975b64e..00000000
--- a/tests/test-ai-vterm--claude-buffers.el
+++ /dev/null
@@ -1,59 +0,0 @@
-;;; test-ai-vterm--claude-buffers.el --- Tests for cj/--ai-vterm-claude-buffers -*- lexical-binding: t; -*-
-
-;;; Commentary:
-;; The helper returns the list of buffers whose names start with the
-;; literal prefix "claude [".  Order is the same order `buffer-list'
-;; gives them (most-recently-selected first).  Non-claude buffers and
-;; buffers whose names merely contain the prefix as a substring are
-;; excluded.
-
-;;; 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--claude-buffers-empty-when-none-exist ()
-  "Boundary: no claude-prefixed buffers anywhere -> empty list."
-  (cj/test--kill-claude-buffers)
-  (unwind-protect
-      (should (null (cj/--ai-vterm-claude-buffers)))
-    (cj/test--kill-claude-buffers)))
-
-(ert-deftest test-ai-vterm--claude-buffers-returns-only-claude-buffers ()
-  "Normal: filters to only claude-prefixed buffers, leaves others alone."
-  (cj/test--kill-claude-buffers)
-  (let ((c1 (get-buffer-create "claude [a]"))
-        (c2 (get-buffer-create "claude [b]"))
-        (other (get-buffer-create "regular-buffer")))
-    (unwind-protect
-        (let ((result (cj/--ai-vterm-claude-buffers)))
-          (should (memq c1 result))
-          (should (memq c2 result))
-          (should-not (memq other result))
-          (should (= (length result) 2)))
-      (kill-buffer c1)
-      (kill-buffer c2)
-      (kill-buffer other))))
-
-(ert-deftest test-ai-vterm--claude-buffers-anchors-prefix-not-substring ()
-  "Boundary: 'foo claude [bar]' is not a claude buffer -- prefix anchored."
-  (cj/test--kill-claude-buffers)
-  (let ((not-claude (get-buffer-create "foo claude [bar]")))
-    (unwind-protect
-        (should-not (memq not-claude (cj/--ai-vterm-claude-buffers)))
-      (kill-buffer not-claude))))
-
-(ert-deftest test-ai-vterm--claude-buffers-bare-claude-not-included ()
-  "Boundary: 'claude' alone (no bracket) doesn't match the 'claude [' prefix."
-  (cj/test--kill-claude-buffers)
-  (let ((bare (get-buffer-create "claude")))
-    (unwind-protect
-        (should-not (memq bare (cj/--ai-vterm-claude-buffers)))
-      (kill-buffer bare))))
-
-(provide 'test-ai-vterm--claude-buffers)
-;;; test-ai-vterm--claude-buffers.el ends here