Restart the payer with a pending RGB HTLC in close_force_pending_htlc

[dcorral]

Restarts the payer in close_force_pending_htlc while the colored HTLC is still pending, so the channel state must round-trip through persistence with an HTLC in flight. Without RGB-Tools/rust-lightning#32 the node fails to come back up at this point, with it the test passes. The rust-lightning submodule is updated to include that fix.

[zoedberg]

Please first push only the test and let the CI run so that we see that the test reproduces the bug. Then add the commit that updates the submodule containing the fix

[zoedberg]

@dcorral I noticed the fix is for both inbound and outbound HTLCs, but the test is restarting only one node. Could you also add a node2 restart (before the force-close, mirroring the node1 one) so the test exercises the inbound deserialization path too, not just outbound? That way the regression covers both write sites the fix touches.

[dcorral]

Done, the payee is now restarted as well before the force close, so both the outbound and inbound pending-HTLC paths go through deserialization. Kept the PR test-only for now so CI shows the failure; the submodule update with the fix follows once the red run is on record.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.78%. Comparing base (e10209e) to head (463b244).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #136      +/-   ##
==========================================
+ Coverage   87.74%   87.78%   +0.03%     
==========================================
  Files          13       13              
  Lines        7613     7613              
==========================================
+ Hits         6680     6683       +3     
+ Misses        933      930       -3     

Flag	Coverage Δ
rust	87.78% <ø> (+0.03%)	⬆️

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[zoedberg]

LGTM, thank you!