QA round 1 (PR #632) flagged that the SubagentStart hook uses matcher "*",
the same matcher a user is most likely to pick for their own catch-all
SubagentStart hook. Because is_cmm_hook_entry keyed ownership on the matcher
string alone, install would remove the user's "*" entry and replace it with
ours, and uninstall could remove the wrong one.
Add an optional `match_command_substr` to the upsert/remove args, threaded into
is_cmm_hook_entry: when set, an entry must ALSO carry a hooks[].command
containing that substring to be claimed as ours. The Claude SubagentStart hook
passes "cbm-subagent-reminder"; all existing callers leave it NULL, preserving
their matcher-only behavior unchanged. Install/uninstall now only ever touch
CMM's own entry and never clobber a foreign "*" hook.
Add cli_claude_subagent_hook_preserves_user_entry covering the case: a
pre-existing user "*" SubagentStart hook survives both install and uninstall.
Signed-off-by: Shane McCarron <shane.mccarron@corvexconnect.com>
Shane McCarron
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