refact(comments): state the mechanism, not the incident

Every comment that invoked a 'law' (50 word-boundary sites across 28
tracked files) now states what is going on and why, in terms that
transfer to any project: gate twins drift until one side greenlights
what the other refuses; a tag re-points while a digest pins; a
restrictive engine behavior belongs to the runtime that imposed it and
must be re-tested, not inherited; a speculative head is tensors in the
file, not a flag; snapshot links dangle where the container resolves
them; exit 0 is a clean stop to systemd, so a self-exiting daemon on
on-failure goes dark reporting success. Event narratives and dates are
gone from these comments; the mechanics carry the argument.

Behavior-identical: bash -n, py_compile, yaml parse, full bats suite
408/408 green. One symbol rename rides along (stack script local
scale_law -> scale_contract, with its log text).

scripts/download-frank-archon-swift15.sh

@@ -14,10 +14,11 @@
 # Fetch uses the vendored scripts/hfget.sh (StillDeadcode's Apache-2.0
 # listing/resume downloader, curl+jq only): per-file size checks against
 # the Hub listing, `-C -` resume, pickle-format duplicates skipped.
-# Verify (default) is the AGENTS.md law in three parts: every listed file
-# present with the listed size, the shard count matches the weight-map
-# index, and every shard's sha256 equals the Hub's LFS oid. Verify needs
-# only the public API.
+# Verify (default) is three independent agreements: every listed file
+# present with the listed size (catches truncation), the shard count
+# matching the weight-map index (catches omissions), and every shard's
+# sha256 equal to the Hub's LFS oid (catches substituted content).
+# Verify needs only the public API.
 set -euo pipefail
 
 REPO="ukisai/Swift1.5-Qwen3.8-Flash-Next"