fix(hook): treat a shell-wrapped claude as primary, not nested

[paskal]

Hi there, thanks a lot for ccgram, the tmux-side-rather-than-SDK-side approach is exactly what I wanted.## Problem_is_nested_session treats a claude as primary only when its PID equals the foreground process group id on the pane's tty:python owner = _closest_claude_ancestor(snapshot, os.getpid()) if owner is None: return False return owner != fg_pgid That holds when a shell execs claude directly, but not when a launcher starts the agent as bash -lc "... && claude ...". The shell stays group leader, so the primary claude is its child and its PID never equals the foreground PGID. On such a pane:fg pgid = 14053 /bin/bash claude = 14058 (pgid 14053)Every hook that session fires is then classified as a nested observer and dropped. It fails silently, so session_map.json is never written and Telegram forwarding never starts for that window. ccgram doctor reports all hooks installed and the topic binds fine, which makes it look like a transcript problem rather than a discarded hook.This is how agent-deck launches sessions, so ccgram adopts its windows as topics and then stays silent in all of them.## ChangeDecide nesting by asking whether another claude sits above this one in the process tree, rather than whether it happens to lead the process group. The fast path for a group-leading primary is kept, and every fails-open branch is untouched.This preserves #62, which the guard was written for. It is arguably a closer test of that issue's intent than the pgid comparison, since a nested claude inherits the parent's pgid rather than getting its own, as the original comment notes, so PID vs PGID cannot reliably separate the two shapes on its own.Two cases added to TestNestedSessionDetection: a shell-wrapped primary is not nested, and an observer under a shell-wrapped primary still is. The existing cases in that class and test_nested_session_start_does_not_steal_forwarding pass unchanged.Verified on a real agent-deck session, where hooks were dropped before the change and bind correctly after it, with session_map.json getting the right session id, transcript path and provider_name: claude.