docs: file the signal-pager and triage findings

Nine tasks filed, from four senders and my own work. Two are [#A]: the triage github-prs precondition passes on a work credential, so a personal sweep returns work PRs, and the pager receive timer on ratio, which is now fixed.

Three of the filings are one bug wearing different clothes. A guard that can't tell "nothing to do" from "couldn't do it" reports success either way. It showed up in the receive timer, in the triage engine, and in a test that went green at exit 127 against a path that didn't exist. Worth fixing as a class rather than three times.

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