fix: fix: duplicated memory guard — memory_guard() in env.sh vs check_memory() in formula-session.sh (#279)

Remove check_memory() from lib/formula-session.sh and update all *-run.sh scripts
to use memory_guard() from lib/env.sh.

Changes:
- lib/formula-session.sh: Removed check_memory() function and its documentation
- gardener/gardener-run.sh: Replaced check_memory(2000) with memory_guard(2000)
- planner/planner-run.sh: Replaced check_memory(2000) with memory_guard(2000)
- architect/architect-run.sh: Replaced check_memory(2000) with memory_guard(2000)
- predictor/predictor-run.sh: Replaced check_memory(2000) with memory_guard(2000)
- supervisor/supervisor-run.sh: Replaced check_memory(2000) with memory_guard(2000)

Benefits:
- Only one memory check function exists now
- All agents use the same function
- No dependency on free command - uses /proc/meminfo which is more portable

architect/architect-run.sh

@@ -49,7 +49,7 @@ log() { echo "[$(date -u +%Y-%m-%dT%H:%M:%S)Z] $*" >> "$LOG_FILE"; }
 # ── Guards ────────────────────────────────────────────────────────────────
 check_active architect
 acquire_cron_lock "/tmp/architect-run.lock"
-check_memory 2000
+memory_guard 2000
 
 log "--- Architect run start ---"
 

gardener/gardener-run.sh

@@ -60,7 +60,7 @@ log() { echo "[$(date -u +%Y-%m-%dT%H:%M:%S)Z] $*" >> "$LOG_FILE"; }
 # ── Guards ────────────────────────────────────────────────────────────────
 check_active gardener
 acquire_cron_lock "/tmp/gardener-run.lock"
-check_memory 2000
+memory_guard 2000
 
 log "--- Gardener run start ---"
 

lib/formula-session.sh

@@ -6,7 +6,6 @@
 #
 # Functions:
 #   acquire_cron_lock   LOCK_FILE          — PID lock with stale cleanup
-#   check_memory        [MIN_MB]           — skip if available RAM too low
 #   load_formula        FORMULA_FILE       — sets FORMULA_CONTENT
 #   build_context_block FILE [FILE ...]    — sets CONTEXT_BLOCK
 #   build_prompt_footer [EXTRA_API_LINES]  — sets PROMPT_FOOTER (API ref + env)
@@ -51,23 +50,6 @@ acquire_cron_lock() {
   trap 'rm -f "$_CRON_LOCK_FILE"' EXIT
 }
 
-# check_memory [MIN_MB]
-# Exits 0 (skip) if available memory is below MIN_MB (default 2000).
-check_memory() {
-  local min_mb="${1:-2000}"
-  # Graceful fallback if free command is not available (procps not installed)
-  if ! command -v free &>/dev/null; then
-    log "run: free not found, skipping memory check"
-    return 0
-  fi
-  local avail_mb
-  avail_mb=$(free -m | awk '/Mem:/{print $7}')
-  if [ "${avail_mb:-0}" -lt "$min_mb" ]; then
-    log "run: skipping — only ${avail_mb}MB available (need ${min_mb})"
-    exit 0
-  fi
-}
-
 # ── Agent identity resolution ────────────────────────────────────────────
 
 # resolve_agent_identity

planner/planner-run.sh

@@ -48,7 +48,7 @@ log() { echo "[$(date -u +%Y-%m-%dT%H:%M:%S)Z] $*" >> "$LOG_FILE"; }
 # ── Guards ────────────────────────────────────────────────────────────────
 check_active planner
 acquire_cron_lock "/tmp/planner-run.lock"
-check_memory 2000
+memory_guard 2000
 
 log "--- Planner run start ---"
 

predictor/predictor-run.sh

@@ -49,7 +49,7 @@ log() { echo "[$(date -u +%Y-%m-%dT%H:%M:%S)Z] $*" >> "$LOG_FILE"; }
 # ── Guards ────────────────────────────────────────────────────────────────
 check_active predictor
 acquire_cron_lock "/tmp/predictor-run.lock"
-check_memory 2000
+memory_guard 2000
 
 log "--- Predictor run start ---"
 

supervisor/supervisor-run.sh

@@ -51,7 +51,7 @@ log() { echo "[$(date -u +%Y-%m-%dT%H:%M:%S)Z] $*" >> "$LOG_FILE"; }
 # ── Guards ────────────────────────────────────────────────────────────────
 check_active supervisor
 acquire_cron_lock "/tmp/supervisor-run.lock"
-check_memory 2000
+memory_guard 2000
 
 log "--- Supervisor run start ---"