[rpms/cjs] rawhide: Document reason for 'Epoch:1'

[Michal Schorm <mschorm@redhat.com>]

            A new commit has been pushed.

            Repo   : rpms/cjs
            Branch : rawhide
            Commit : fbe1701af540c317cde694a64a37a3ab5e39d3b4
            Author : Michal Schorm <mschorm@redhat.com>
            Date   : 2026-07-26T19:56:40+02:00
            Stats  : +1/-0 in 1 file(s)
            URL    : https://src.fedoraproject.org/rpms/cjs/c/fbe1701af540c317cde694a64a37a3ab5e39d3b4?branch=rawhide

            Log:
            Document reason for 'Epoch:1'

The Epoch was introduced when cjs was revived in Fedora
(commit 09c3ddb, per https://pagure.io/releng/issue/7938).
The version dropped from 1.34.0 to 1.9.1, requiring Epoch:1
to maintain upgrade path continuity.

The current version (140.0) is well above the old 1.34.0, but
Epoch can never be removed once set — doing so would break
upgrades for existing installations.

Co-Authored-By: Claude AI <noreply@anthropic.com>

---
diff --git a/cjs.spec b/cjs.spec
index 91c5366..e4aba6b 100644
--- a/cjs.spec
+++ b/cjs.spec
@@ -3,6 +3,7 @@
 %global mozjs140_version 140.6.0
 
 Name:          cjs
+# Epoch needed: version dropped from 1.34.0 to 1.9.1 during package revival
 Epoch:         1
 Version:       140.0
 Release:       2%{?dist}