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* refactor(handlers): use GetOrEnsureExecution for workspace ops Per CLAUDE.md, workspace-oriented handlers should use GetOrEnsureExecution so they survive backend restarts. Two git ops in this file (wsGitCommits, wsCumulativeDiff) already followed this pattern; the shared helper and the shell.subscribe handler did not. Changes: - git_handlers.getAgentCtlClient: now takes ctx and uses GetOrEnsureExecution. Propagates to all 14 git ops routing through the helper (pull, push, rebase, merge, abort, commit, stage, unstage, discard, createPR, revertCommit, renameBranch, reset, commitDiff). - shell_handlers.wsShellSubscribe: matches wsShellStatus in the same file. Left alone (intentional): - shell_handlers.wsShellInput: the 5s workspace-stream wait is too short to absorb a cold-start of agentctl, so we still require an existing execution. - passthrough_handlers: stdin/resize require a live agent process per the rule. - git_handlers post-success/failure callbacks: just look up TaskID; ensuring would be wasteful. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com> * test(handlers): cover wsShellSubscribe no-instance path Mirrors TestWsShellInput_NoInstanceFound. Closes a coverage gap flagged in PR review — the handler was switched to GetOrEnsureExecution but had no direct tests for the lookup-failure path. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com> --------- Co-authored-by: Kandev Agent <agent@kandev.dev> Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>