feat: v0.9.0 conversation search, plan usage meters, quiet phone at the desk

- devdesk attach --search (grep + jq over ~/.claude/projects, six files at
  a time) and --resume-convo NAME ID [fork]; devdesk-claude-run passes
  --fork-session once. Search dialog with Resume / Fork / Open.
- statusLine snapshots rate_limits and pr; footer/menu meters with a 90 %
  warning; PR chip on session rows.
- CLAUDE_CLIENT_PRESENCE_FILE per tmux session id; --presence on|off with a
  self-expiring marker; the page heartbeats it while visible.

Closes #24
Closes #25
Closes #26

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

libexec/devdesk-claude-run

@@ -42,15 +42,22 @@ run_new() {
 }
 
 run_resume() {
-    local id args started rc
+    local id args started rc fork=()
     id=$(dd_registry_get "$NAME" claude_session_id)
     if [ -z "$id" ]; then
         run_new
         return
     fi
     mapfile -d '' args < <(common_args)
+    # "Fork" from conversation search (devdesk#24): continue as a new
+    # conversation, once; the SessionStart hook then records the new id.
+    if [ "$(dd_registry_get "$NAME" fork)" = true ]; then
+        fork=(--fork-session)
+        # shellcheck disable=SC2016 # $n is a jq variable
+        dd_registry_update 'del(.sessions[$n].fork)' --arg n "$NAME" 2>/dev/null || true
+    fi
     started=$SECONDS
-    "$CLAUDE_BIN" --resume "$id" "${args[@]}"
+    "$CLAUDE_BIN" --resume "$id" "${fork[@]}" "${args[@]}"
     rc=$?
     # A resume that fails straight away means the transcript is gone; start fresh.
     if [ "$rc" -ne 0 ] && [ $((SECONDS - started)) -lt 10 ]; then
@@ -69,6 +76,14 @@ menu() {
 }
 
 printf '\033]2;%s\033\134' "$NAME" # pane title (ST = ESC \\)
+
+# While a DevDesk tab shows this session, this marker exists and Claude tells
+# Remote Control a client is present, which holds back phone pushes (devdesk#26).
+# Keyed by tmux's session id, which survives renames.
+sid=$(dd_tmux display -p -t "${TMUX_PANE:-}" '#{session_id}' 2>/dev/null)
+if [ -n "$sid" ]; then
+    export CLAUDE_CLIENT_PRESENCE_FILE="$DEVDESK_PRESENCE_DIR/${sid#\$}"
+fi
 mode=resume
 while :; do
     NAME=$(dd_current_session) # follow renames