chore: sync local state

Estate-wide chore-drift sweep committing accumulated local state
(gitignore, lockfiles, dotfile tweaks, workflow SHA bumps, A2ML
migration drift, doc sweeps) so the estate-wide Dependabot fix
propagation can proceed without skipping this repo.

No source-file edits were in scope for this commit; repos with
in-flight source work were excluded and kicked back for manual
review.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

.gitignore

@@ -110,3 +110,11 @@ sync_report*.txt
 
 # Machine-readable locks
 .machine_readable/.locks/
+target/
+node_modules/
+_build/
+deps/
+.elixir_ls/
+.cache/
+build/
+dist/