From 855845815c626b15c1ca739ee91381b393c86af6 Mon Sep 17 00:00:00 2001
From: Craig Jennings <c@cjennings.net>
Date: Sat, 14 Feb 2026 17:19:57 -0600
Subject: perf(calendar-sync): replace shell-out timezone conversion with pure
 Elisp
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convert-tz-to-local was spawning a `date` subprocess per timestamp,
causing ~15s parse freezes on Proton (223 events) and ~10s on Google
(1543 events). Replaced with encode-time/decode-time ZONE argument —
same TZ database, no subprocess overhead. Parse times now 0.2-2.8s.

Also adds phase timing instrumentation behind cj/debug-modules flag.
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