docs: file the inbox-send and test-determinism findings

I found two bugs while fixing the cmail-action path, both unrelated to it.

inbox-send has the same defect cmail-action had: bare invocation is the documented form across the rule layer and five workflows, and it isn't on PATH. Graded [#B] rather than [#C] on frequency, since cross-project handoffs are routine where mail sends aren't.

The argument for grading it worse is that a lost handoff is silent where a failed send is loud. I checked rather than assuming. The router resolves the script by path and gates on the return code, and a bare invocation fails visibly, so both paths are loud and the band holds. That argument stays on file because it would be right the moment a caller wraps the send in a swallowed subshell.

The other is a bats case that reads the real PATH for a binary it asserts about, so it passes only on a machine that happens to have codex installed. It was failing before today's work. Until it lands, green here means "only that case fails".

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