afa7aead24
In practice, we were too strict. Here's Phoenix paying my node via another node:
```
2025-08-25T13:57:53.311Z DEBUG 02...-chan#216: Failing HTLC because of an invalid payload (TLV 10 pos 103): cltv_expiry 911816 > payment_constraint 911721
```
We add 6 blocks, but this is supposed to be the *max* allowed. Increase it to 1008, to allow shadow padding. Here are the CLTV delays across advertized channels in the network: most are far less than this:
Count Delay
1 0
1 4
3 12
899 18
602 20
1 22
3 24
1 25
9 26
5 29
72 30
54 32
4352 34
2 35
6 36
10 37
27 38
8 39
15256 40
94 42
102 44
13 45
20 46
87 48
230 50
100 51
14 55
316 60
29 64
30 65
24 68
82 69
9 70
779 72
13 77
243 78
1 79
26793 80
1 82
6 83
1 84
18 85
1 86
9 87
16 88
101 89
2 90
11 96
113 99
9527 100
41 112
34 118
132 119
403 120
24 128
232 140
138 142
14303 144
2 145
41 150
6 160
3 172
8 174
27 180
4 190
297 200
99 210
34 216
219 222
15 240
105 288
17 300
7 336
1 360
19 400
24 420
26 432
20 450
1 480
12 500
1 720
1 850
1 1000
1 1002
1 1144
1 1192
5 1201
1 1444
1 1795
1 1900
1 2016
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Changelog-Changed: Protocol: Offers on nodes with only private channels are now payable (i.e. no more blinded path errors!).
Fixes: https://github.com/ElementsProject/lightning/issues/7718
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