fix(shell): remove runtime early-exit pipe hazards

packages/mosaic/framework/tools/wake/detector.sh

@@ -123,7 +123,7 @@ _manifest_val() {
   # _manifest_val KEY — echo VALUE for KEY=VALUE in the manifest (blank if none).
   local key="$1"
   [ -f "$MANIFEST" ] || return 0
-  sed -n "s/^${key}=//p" "$MANIFEST" | head -n1 | tr -d '[:space:]'
+  awk -v key="$key" 'index($0, key "=") == 1 { sub(/^[^=]*=/, ""); gsub(/[[:space:]]/, ""); print; exit }' "$MANIFEST"
 }
 
 # _load_watchlist — validate the watch-list path + JSON + schema_version range.
@@ -267,7 +267,7 @@ _poll_source() {
     if snap_json="$(jq -ce '.' <<<"$rawmeta" 2>/dev/null)"; then
       snap_sha="$(jq -r 'if (.snapshot_sha|type) == "string" then .snapshot_sha else "" end' <<<"$snap_json")"
       snap_ts="$(jq -r 'if (.snapshot_ts|type) == "number" then (.snapshot_ts|floor|tostring) else "" end' <<<"$snap_json")"
-      if [ -n "$snap_sha" ] && ! printf '%s' "$snap_sha" | grep -Eq '^[0-9a-f]{7,64}$'; then
+      if [ -n "$snap_sha" ] && ! grep -Eq '^[0-9a-f]{7,64}$' <<<"$snap_sha"; then
         echo "detector.sh: source '$kind/$id' snapshot_sha rejected (not a 7-64 char lowercase-hex git sha) — snapshot metadata DROPPED, poll continues (#940)." >&2
         snap_sha=""
         snap_ts=""
@@ -275,7 +275,7 @@ _poll_source() {
       # A ts must be a sane positive epoch BEFORE any arithmetic touches it: a
       # negative or absurdly large value would make the shell integer comparison
       # below error out and silently KEEP the bad ts — validate first, compare after.
-      if [ -n "$snap_ts" ] && ! printf '%s' "$snap_ts" | grep -Eq '^[0-9]{1,12}$'; then
+      if [ -n "$snap_ts" ] && ! grep -Eq '^[0-9]{1,12}$' <<<"$snap_ts"; then
         echo "detector.sh: source '$kind/$id' snapshot_ts rejected (not a sane positive epoch) — snapshot_ts DROPPED, poll continues (#940)." >&2
         snap_ts=""
       fi

packages/mosaic/framework/tools/wake/digest.sh

@@ -644,7 +644,8 @@ cmd_render() {
         oseq="$(jq -r '.observed_seq // "?"' <<<"$line")"
         oclass="$(jq -r '.class // "actionable"' <<<"$line")"
         oloc="$(jq -c '.locators // {}' <<<"$line")"
-        olabel="$(_locator_line "$oloc" | head -n1)"
+        olabel="$(_locator_line "$oloc")"
+        olabel="${olabel%%$'\n'*}"
         printf '  * seq %s [%s] %s\n' "$oseq" "$(_scrub_inline "$oclass")" "$olabel"
       done <<<"$pending"
     fi

packages/mosaic/framework/tools/wake/reconcile.sh

@@ -146,7 +146,7 @@ EOF
 _manifest_val() {
   local key="$1"
   [ -f "$MANIFEST" ] || return 0
-  sed -n "s/^${key}=//p" "$MANIFEST" | head -n1 | tr -d '[:space:]'
+  awk -v key="$key" 'index($0, key "=") == 1 { sub(/^[^=]*=/, ""); gsub(/[[:space:]]/, ""); print; exit }' "$MANIFEST"
 }
 
 # _load_watchlist — validate path + JSON + shape + Gate B schema range (mirrors