feat(experimental): add reveal_hidden_cursor_for_cjk_ime opt-in for CJK IME tracking

When the focused pane requests ?25l (cursor hidden) but paints its own
cursor — common in TUIs like Claude Code, pi, and codex — macOS native
input methods stop tracking the candidate-window position. CJK users
(Chinese / Japanese / Korean) cannot see candidate windows follow as
they type. Setting [experimental] reveal_hidden_cursor_for_cjk_ime = true
exposes the focused pane's cursor anchor to the outer terminal regardless
of the pane's hidden-cursor request, restoring IME tracking for CJK input.

[experimental] cjk_ime_agents is an optional allow-list. When empty,
the reveal applies to any focused pane. When non-empty (e.g.
["claude", "codex"]), the reveal only applies if the focused pane's
detected agent matches one of the listed names. This lets users enable
the workaround only for AI-agent TUIs that paint their own cursor,
leaving plain shells and other programs untouched. Accepted names: pi,
claude, codex, gemini, cursor, cline, opencode, copilot, kimi, kiro,
droid, amp, grok, hermes. Unknown names are ignored.

When the pane reports no cursor position (cursor_state returns None for
some TUIs), the anchor falls back to the pane's top-left so a stable
IME hint is always available.

[experimental] cjk_ime_cursor_shape (default "steady_block") controls
the DECSCUSR shape rendered for the revealed cursor; six variants are
accepted: block, steady_block, underline, steady_underline, bar,
steady_bar.

Trade-off when enabled: a hardware cursor will be visible in the outer
terminal for apps that hide the cursor without painting a replacement.
Default false preserves the behavior set in 2c95071. Pair the reveal
with cjk_ime_agents to scope it to specific TUIs.

Manually verified on macOS 26.5 aarch64 with system Pinyin IME against
Claude Code: candidate window tracks cursor with flag enabled, returns
to anchored-at-start behavior with flag disabled.

refs #149

2 files changed, 24 insertions, 0 deletions

diff --git a/docs/next/CHANGELOG.md b/docs/next/CHANGELOG.md
index d2457878..f504ac25 100644
--- a/docs/next/CHANGELOG.md
+++ b/docs/next/CHANGELOG.md
@@ -14,6 +14,7 @@
 - Added update badges on the sidebar menu, settings menu item, and integrations settings tab when installed integrations are outdated.
 - Added `terminal.default_shell` to choose the executable used for new interactive panes. When unset, Herdr still falls back to `$SHELL`, then `/bin/sh`. (#196)
 - Added native Kiro CLI detection with idle and working state heuristics. (#185)
+- Added `experimental.reveal_hidden_cursor_for_cjk_ime = false` (opt-in), `experimental.cjk_ime_agents = []` (optional allow-list), and `experimental.cjk_ime_cursor_shape = "steady_block"` to expose the focused pane's cursor anchor to the outer terminal even when the pane requested `?25l`, restoring macOS IME candidate-window tracking for TUIs that paint their own cursor (Claude Code, pi, codex). When `cjk_ime_agents` is non-empty, the reveal applies only to focused panes whose detected agent matches one of the listed names. When the pane reports no cursor position, the anchor falls back to the pane's top-left so a stable IME hint is always available. Trade-off when enabled: an extra hardware cursor may appear in the outer terminal for apps that hide the cursor without painting a replacement. (#149)
 
 ### Fixed
 - Keybinding conflict warnings now stay visible and show one readable yellow row per conflicting binding.
diff --git a/docs/next/website/src/content/docs/configuration.mdx b/docs/next/website/src/content/docs/configuration.mdx
index 9df7e41d..a026166a 100644
--- a/docs/next/website/src/content/docs/configuration.mdx
+++ b/docs/next/website/src/content/docs/configuration.mdx
@@ -284,6 +284,29 @@ kitty_graphics = false
 
 Leave this off unless you are testing terminal image behavior.
 
+## IME cursor tracking
+
+When the focused pane hides its cursor and paints its own — common in AI-agent TUIs like Claude Code, pi, and codex — macOS native input methods stop tracking the candidate window position because the outer terminal stops reporting the cursor.
+
+Set `reveal_hidden_cursor_for_cjk_ime = true` to expose the focused pane's cursor anchor to the outer terminal regardless of the pane's `?25l` request:
+
+```toml
+[experimental]
+reveal_hidden_cursor_for_cjk_ime = false
+cjk_ime_agents = []
+cjk_ime_cursor_shape = "steady_block"
+```
+
+When enabled, the cursor stays visible at the focused pane's reported position. If the pane reports no cursor position, the anchor falls back to the pane's top-left so a stable IME hint is always available.
+
+`cjk_ime_agents` is an optional allow-list. When empty, the reveal applies to any focused pane. When non-empty, the reveal only applies if the focused pane's detected agent matches one of the listed names — useful to enable the reveal only for AI-agent TUIs that paint their own cursor while leaving plain shells untouched. Accepted names: `pi`, `claude`, `codex`, `gemini`, `cursor`, `cline`, `opencode`, `copilot`, `kimi`, `kiro`, `droid`, `amp`, `grok`, `hermes`. Unknown names are ignored.
+
+`cjk_ime_cursor_shape` controls the DECSCUSR shape rendered for the IME anchor. Accepted values: `block`, `steady_block` (default), `underline`, `steady_underline`, `bar`, `steady_bar`.
+
+Hot-reloads through the existing `[experimental]` block.
+
+The trade-off when enabled: an extra hardware cursor is visible in the outer terminal for apps that hide the cursor without painting a replacement (vim normal mode, etc.). Pair the reveal with `cjk_ime_agents` to scope it to specific TUIs.
+
 ## Environment variables
 
 | Variable | Purpose |