refactor: remove code comments added by recent PRs (#16681)

CONTRIBUTING.md says PRs add no code comments, but #16485, #16586, #16621 and #16672 added some. This removes the 215 comment-only lines git blame on master attributes to those merge commits, across 12 code files, plus one blank line the removal left doubled. Rewritten (not added) comments in scripts/assert-cloud-image-sentry.mjs and comments in .github workflows are left alone. No code changes.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

scripts/server-boot-smoke.sh

@@ -1,20 +1,4 @@
 #!/usr/bin/env bash
-# Boot a built server command and wait for it to become healthy.
-#
-#   scripts/server-boot-smoke.sh node server/dist-runtime/index.mjs
-#
-# Starts the command against a throwaway instance (embedded Postgres,
-# local_trusted mode, loopback only) and waits until GET /api/health reports
-# status "ok", which means migrations applied and startup recovery finished.
-# Prints the time to listen and the time to ready, stops the server, and exits
-# non-zero if it never became ready, with the server log on stderr.
-#
-# The server runs with a cleared environment (only PATH and a scratch HOME),
-# from a scratch working directory, with its config path pointed into the
-# scratch directory, so no DATABASE_URL, config file or .env from the caller
-# can point it at a real instance. It listens on a free port chosen at start,
-# and a healthy response counts only after the child logs that it bound that
-# port. Relative command arguments are resolved against the repository root.
 set -euo pipefail
 
 if [ "$#" -eq 0 ]; then
@@ -71,7 +55,6 @@ while [ "$(date +%s)" -lt "$deadline" ]; do
     cat "$log" >&2
     exit 1
   fi
-  # Only trust the port once this child has bound it.
   if ! grep -q "listener bound on 127.0.0.1:$port" "$log" 2>/dev/null; then sleep 0.5; continue; fi
   body="$(curl -fsS --max-time 2 "http://127.0.0.1:$port/api/health" 2>/dev/null || true)"
   if [ -n "$body" ] && [ -z "$listen_ms" ]; then