fix(opencode): clarify git amend condition to require verifying commit landed (#19937)

Co-authored-by: Aiden Cline <63023139+rekram1-node@users.noreply.github.com>
Co-authored-by: Luke Parker <10430890+Hona@users.noreply.github.com>
Co-authored-by: Brendan Allan <14191578+Brendonovich@users.noreply.github.com>
Co-authored-by: opencode-agent[bot] <opencode-agent[bot]@users.noreply.github.com>
Co-authored-by: Shoubhit Dash <shoubhit2005@gmail.com>

packages/opencode/src/tool/bash.txt

@@ -58,7 +58,7 @@ Git Safety Protocol:
 - NEVER skip hooks (--no-verify, --no-gpg-sign, etc) unless the user explicitly requests it
 - NEVER run force push to main/master, warn the user if they request it
 - Avoid git commit --amend. ONLY use --amend when ALL conditions are met:
-  (1) User explicitly requested amend, OR commit SUCCEEDED but pre-commit hook auto-modified files that need including
+  (1) User explicitly requested amend, OR the commit succeeded and pre-commit hooks auto-modified files that need including — verify by checking `git log` that HEAD is the new commit before amending
   (2) HEAD commit was created by you in this conversation (verify: git log -1 --format='%an %ae')
   (3) Commit has NOT been pushed to remote (verify: git status shows "Your branch is ahead")
 - CRITICAL: If commit FAILED or was REJECTED by hook, NEVER amend - fix the issue and create a NEW commit