deps: bump gollm fork to the gpt-5 max_completion_tokens fix

Repins the networkteam/gollm replace to 19e75fe, which teaches the
OpenAI provider to emit max_completion_tokens for gpt-5-class models
(upstream PR teilomillet/gollm#61). Fixes the HTTP 400 that broke
OpenAI gpt-5 summary and pre-flight calls (s-tac-t96).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: hlubek

go.mod

@@ -88,4 +88,4 @@ require (
 // source and honor replace; only `go install pkg@version` (which sdd does not
 // use) would break. Remove this directive once the change lands upstream and
 // bump the require above to the released teilomillet/gollm version.
-replace github.com/teilomillet/gollm => github.com/networkteam/gollm v0.0.0-20260604171358-7aec6bb435d4
+replace github.com/teilomillet/gollm => github.com/networkteam/gollm v0.0.0-20260614104521-19e75febe86b

go.sum

@@ -100,8 +100,8 @@ github.com/modelcontextprotocol/go-sdk v1.6.1 h1:0zOSupjKUxPKSocPT1Wtago+mUHU2/u
 github.com/modelcontextprotocol/go-sdk v1.6.1/go.mod h1:kzm3kzFL1/+AziGOE0nUs3gvPoNxMCvkxokMkuFapXQ=
 github.com/muesli/cancelreader v0.2.2 h1:3I4Kt4BQjOR54NavqnDogx/MIoWBFa0StPA8ELUXHmA=
 github.com/muesli/cancelreader v0.2.2/go.mod h1:3XuTXfFS2VjM+HTLZY9Ak0l6eUKfijIfMUZ4EgX0QYo=
-github.com/networkteam/gollm v0.0.0-20260604171358-7aec6bb435d4 h1:nqOZ8/3OGoPhhLa8Vg/xHgJDwblEcFGaz00sWBca5oM=
-github.com/networkteam/gollm v0.0.0-20260604171358-7aec6bb435d4/go.mod h1:ba4KWPPrYoc7PbPkcjTD6uMi2s5yXVWVsE5uzP+mvCg=
+github.com/networkteam/gollm v0.0.0-20260614104521-19e75febe86b h1:cfE3NvYaTg1cJXz0CDsRIsAlMXZ5f10Yv7lzl+lzCRU=
+github.com/networkteam/gollm v0.0.0-20260614104521-19e75febe86b/go.mod h1:ba4KWPPrYoc7PbPkcjTD6uMi2s5yXVWVsE5uzP+mvCg=
 github.com/networkteam/slogutils v0.4.0 h1:tf6Gf//H/a3EUmNszWEw8fhQkscrDdKt7HEdb2wBUhM=
 github.com/networkteam/slogutils v0.4.0/go.mod h1:j6siLHGfAkUpfhNUXw43EUdZv/HBaGd/RW7ToPwiJZo=
 github.com/philippgille/chromem-go v0.7.0 h1:4jfvfyKymjKNfGxBUhHUcj1kp7B17NL/I1P+vGh1RvY=