fix: tech-debt: sweep cron-isms from code comments, helpers, lib, and public site copy (#548)

- Rename acquire_cron_lock → acquire_run_lock in lib/formula-session.sh
  and all five *-run.sh call sites
- Update all *-run.sh file headers: "Cron wrapper" → "Polling-loop wrapper"
- Rewrite docs/updating-factory.md: replace crontab check with pgrep,
  replace "Crontab empty after restart" section with polling-loop equivalent
- Update docs/EVAL-MCP-SERVER.md to reflect polling-loop reality
- Update lib/guard.sh, lib/AGENTS.md, lib/ci-setup.sh comments
- Update formulas/*.toml comments (cron → polling loop)
- Update dev/dev-poll.sh usage comment
- Update tests/smoke-init.sh to handle compose vs bare-metal scheduling
- Update .woodpecker/agent-smoke.sh comments
- Update site HTML: architecture.html, quickstart.html, index.html
- Clarify _install_cron_impl is bare-metal only (compose uses polling loop)
- Keep site/collect-engagement.sh and site/collect-metrics.sh cron refs
  (genuinely cron-driven on the website host, separate from factory loop)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

predictor/predictor-run.sh

@@ -1,12 +1,12 @@
 #!/usr/bin/env bash
 # =============================================================================
-# predictor-run.sh — Cron wrapper: predictor execution via SDK + formula
+# predictor-run.sh — Polling-loop wrapper: predictor execution via SDK + formula
 #
 # Synchronous bash loop using claude -p (one-shot invocation).
 # No tmux sessions, no phase files — the bash script IS the state machine.
 #
 # Flow:
-#   1. Guards: cron lock, memory check
+#   1. Guards: run lock, memory check
 #   2. Load formula (formulas/run-predictor.toml)
 #   3. Context: AGENTS.md, ops:RESOURCES.md, VISION.md, structural graph
 #   4. agent_run(worktree, prompt) → Claude analyzes, writes to ops repo
@@ -14,7 +14,7 @@
 # Usage:
 #   predictor-run.sh [projects/disinto.toml]   # project config (default: disinto)
 #
-# Cron: 0 6 * * * cd /path/to/dark-factory && bash predictor/predictor-run.sh
+# Called by: entrypoint.sh polling loop (daily)
 # =============================================================================
 set -euo pipefail
 
@@ -57,7 +57,7 @@ log() {
 
 # ── Guards ────────────────────────────────────────────────────────────────
 check_active predictor
-acquire_cron_lock "/tmp/predictor-run.lock"
+acquire_run_lock "/tmp/predictor-run.lock"
 memory_guard 2000
 
 log "--- Predictor run start ---"