agent search: spotlight-style fuzzy finder on ctrl+opt+cmd+shift+u

a centered, non-activating key panel that lists every agent and jumps to
the chosen one through the same dingger focus path as a row click.

- fzf-style matching: each word must match one of name, session, window,
  harness, status, or directory, letters in order; the best alignment wins
  (word starts and consecutive runs score higher), matched title letters
  are highlighted.
- empty query keeps the menu's order, so enter jumps to the top waiting
  agent.
- the selection follows the agent, not the position, as states change;
  the list scrolls to keep it visible.
- keys: arrows, ctrl+n/p, ctrl+j/k, enter, esc, ctrl+u; the shortcut again
  or clicking elsewhere closes it.
- search_hotkey setting; an unedited config file is upgraded. menu item
  "Search Agents...". rows carry the pane's directory.
- --print-search and --snapshot-search debug flags; the panel's background
  and snapshot code are shared.

selftest covers matching, ranking, highlighting, and selection; e2e step
15 checks queries through the real binary (fails when search only looks at
titles). e2e resolves relative binary paths, which tmux hooks need.

1 files changed, 12 insertions, 3 deletions

diff --git a/README.md b/README.md
index 9d54428..fb843ba 100644
--- a/README.md
+++ b/README.md
@@ -49,8 +49,16 @@ than a poll is still a completion.
   (with a "Show all / Show less" toggle for the full list). The panel is
   always dark, in herdr's palette, so it reads the same over any desktop.
 - **Jump shortcut**: **⌃⌥⌘U** jumps to the top waiting agent from anywhere,
-  like clicking the tmux status line. Both shortcuts live in
-  `~/.config/dingger/config.toml` (menu bar, Settings…), reloaded on save.
+  like clicking the tmux status line.
+- **Agent search**: **⌃⌥⇧⌘U** opens a Spotlight-style search over every
+  agent. Type to fuzzy-filter (each word must match, letters in order, the
+  name, session, window, harness, status, or directory); ↑↓ or ⌃N ⌃P / ⌃J ⌃K
+  select, ↩ or a click jumps, esc closes, ⌃U clears. With nothing typed,
+  agents are in the menu's order, so ↩ jumps to the top waiting agent. It
+  takes the keyboard without activating dingger, so focus returns where it
+  was.
+- All shortcuts live in `~/.config/dingger/config.toml` (menu bar,
+  Settings…), reloaded on save.
 - **tmux status line** (`packaging/tmux/dingger.tmux`): the same summary after
   the clock. Clicking it jumps to the top waiting agent (the menu's top row),
   skipping the window you already look at.
@@ -108,7 +116,8 @@ tests/e2e.sh         # end to end against an isolated tmux server
 over the hook protocol, and a real tmux client whose focus it controls. It
 asserts every status transition, attendance by navigation, both click paths
 (including the real menu bar binary), the floating panel's visibility and
-layout rules and content (compact, full, toggle), the status-line segment, latency with a
+layout rules and content (compact, full, toggle), agent search (matching,
+ranking, selection), the status-line segment, latency with a
 deliberately slow notifier, and state surviving a daemon restart. It never
 touches your tmux server.