fix: go to file in big non-git folders; linear reply handling

- find/git producers piped into head tolerate SIGPIPE, so hitting a cap no
  longer fails the command (and lets ttyd truncate its reply).
- fs-find outside git skips build/cache folders and caps at 10000.
- runCommand checks completion on the stream's tail instead of re-decoding
  the whole reply on every frame.

Refs #37

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

libexec/devdesk-files.sh

@@ -7,6 +7,10 @@
 : "${DEVDESK_FS_LIST_MAX:=2000}"      # entries per directory listing
 : "${DEVDESK_ASSETS:=$DEVDESK_SHARE/assets}"
 
+# Producers piped into `head` get SIGPIPE once the cap is reached; under
+# pipefail that would fail the command and cut its reply short, so they are
+# wrapped as `{ producer || true; }`.
+
 # Blob replies: a JSON header line, then base64 between markers (no body for
 # binary files the viewer can't show). The client waits for the END marker.
 DD_BLOB_BEGIN=DEVDESK-BLOB-BEGIN
@@ -81,7 +85,7 @@ cmd_fs_list() {
     [ -d "$dir" ] || dd_die "not a folder: $rel"
     tmp=$(mktemp)
     # %y: type, %Y: type behind a symlink, %s: size, %T@: mtime, %f: name.
-    find "$dir" -mindepth 1 -maxdepth 1 ! -name .git -printf '%y\t%Y\t%s\t%T@\t%f\0' 2>/dev/null |
+    { find "$dir" -mindepth 1 -maxdepth 1 ! -name .git -printf '%y\t%Y\t%s\t%T@\t%f\0' 2>/dev/null || true; } |
         head -z -n "$((DEVDESK_FS_LIST_MAX + 1))" >"$tmp"
     if git --no-optional-locks -C "$dir" rev-parse --is-inside-work-tree >/dev/null 2>&1; then
         ignored=$(tr '\0' '\n' <"$tmp" | cut -f5- | git --no-optional-locks -C "$dir" check-ignore --stdin 2>/dev/null || true)
@@ -98,16 +102,18 @@ cmd_fs_list() {
 
 # --fs-find SESSION: every file under the session folder, for "go to file".
 # git ls-files in a repository (tracked + untracked, .gitignore honoured), else
-# find without node_modules and .git; capped at DEVDESK_FS_FIND_MAX.
+# find without node_modules, .git and build/cache folders; capped at
+# DEVDESK_FS_FIND_MAX (10000).
 cmd_fs_find() {
     [ $# -eq 1 ] || dd_die "usage: devdesk attach --fs-find SESSION"
-    local root max=${DEVDESK_FS_FIND_MAX:-20000}
+    local root max=${DEVDESK_FS_FIND_MAX:-10000}
     root=$(dd_session_root "$1")
     if git --no-optional-locks -C "$root" rev-parse --is-inside-work-tree >/dev/null 2>&1; then
-        git --no-optional-locks -C "$root" ls-files -co --exclude-standard -z 2>/dev/null
+        git --no-optional-locks -C "$root" ls-files -co --exclude-standard -z 2>/dev/null || true
     else
-        (cd "$root" && find . -maxdepth 8 \( -name node_modules -o -name .git -o -name __pycache__ -o -name .venv \) -prune \
-            -o -type f -printf '%P\0' 2>/dev/null)
+        (cd "$root" && find . -maxdepth 8 \( -name node_modules -o -name .git -o -name __pycache__ -o -name .venv -o -name venv \
+            -o -name dist -o -name build -o -name target -o -name .cache -o -name .next -o -name coverage \) -prune \
+            -o -type f -printf '%P\0' 2>/dev/null) || true
     fi | head -z -n "$((max + 1))" |
         jq -cMRs --argjson max "$max" --arg root "$root" \
             '(split("\u0000") | map(select(length > 0))) as $f | {root: $root, truncated: ($f | length > $max), files: $f[:$max]}'
@@ -142,9 +148,9 @@ cmd_git_status() {
     branch=$("${g[@]}" symbolic-ref --short -q HEAD || echo "(detached)")
     {
         printf 'S\n'
-        "${g[@]}" status --porcelain=v1 -z --untracked-files=all -- . 2>/dev/null | head -z -n 1000 | tr '\0' '\n'
+        { "${g[@]}" status --porcelain=v1 -z --untracked-files=all -- . 2>/dev/null || true; } | head -z -n 1000 | tr '\0' '\n'
         printf 'N\n'
-        "${g[@]}" diff --numstat HEAD -- . 2>/dev/null | head -n 1000
+        { "${g[@]}" diff --numstat HEAD -- . 2>/dev/null || true; } | head -n 1000
     } | jq -cMRs --arg root "$root" --arg top "$top" --arg prefix "$prefix" --arg branch "$branch" \
         --rawfile e <(cat -- "$edits" 2>/dev/null || true) '
         (split("\nN\n") | .[0] | ltrimstr("S\n") | split("\n") | map(select(length > 2))) as $st