On Debian 13 (trixie), policykit-1 was retired and pkexec moved
into a standalone package. The previous Depends: policykit-1
made `apt install` fail with \"none of the choices are installable\"
on a fresh trixie VM.
Switch to Depends: pkexec | policykit-1 so apt can satisfy the
constraint on both:
- bookworm: policykit-1 (which provides /usr/bin/pkexec)
- trixie: pkexec (standalone)
Also updates SHA256SUMS and the install README accordingly.
Bundle of all phases (P0-P5) plus the diagnostic fixes from the
end-to-end test session: ephemeral peer/metrics ports, no reqwest
connection pool, short-poll inbox, expanded sidecar path probe.
Smoke-tested by exchanging messages with a second mycelium node in
a Docker container against the public Threefold seed
tcp://188.40.132.242:9651 — bidirectional delivery confirmed.
Built on Debian 12 (bookworm), x86_64, glibc-targeted but the
embedded mycelium binary is musl static.
