docs(signing): clarify Skip option for agent-container use case (#52)

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

CHANGELOG.md

@@ -4,6 +4,11 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
+## [Unreleased]
+
+### Changed
+- Signing wizard "Skip" option now clarifies the agent-container use case (humans sign at PR merge)
+
 ## [0.5.0] - 2026-04-05
 
 ### Added

git-harden.sh

@@ -1250,7 +1250,7 @@ signing_wizard() {
     printf '\n  Signing key options:\n' >&2
     printf '    1) Generate a new ed25519 SSH key (software)\n' >&2
     printf '    2) Generate a hardware-backed SSH key (FIDO2/U2F security key)\n' >&2
-    printf '    s) Skip signing setup\n' >&2
+    printf '    s) Skip signing setup (e.g. in an agent container where humans sign at PR merge)\n' >&2
 
     local choice
     printf '\n  Choose [1/2/s]: ' >&2