fix(kiloclaw): pin Docker Go version to 1.25.8

[joshavant]

Summary

• Pin Go in both KiloClaw image Dockerfiles from 1.26.0 to 1.25.8.
• Avoid go install panics observed during linux/amd64 buildx builds under emulation.
• Keep runtime/tool install behavior unchanged aside from toolchain version.

Verification

• docker run --rm --platform linux/amd64 golang:1.26.0-bookworm env GOBIN=/tmp /usr/local/go/bin/go install github.com/steipete/gogcli/cmd/gog@v0.12.0 (fails with Go runtime panic)
• docker run --rm --platform linux/amd64 golang:1.25.8-bookworm env GOBIN=/tmp /usr/local/go/bin/go install github.com/steipete/gogcli/cmd/gog@v0.12.0 (succeeds)

Visual Changes

• N/A

Reviewer Notes

• Scope is intentionally minimal: only GO_VERSION in services/kiloclaw/Dockerfile and services/kiloclaw/Dockerfile.local.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (2 files)

• services/kiloclaw/Dockerfile
• services/kiloclaw/Dockerfile.local

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_{Reviewed by gpt-5.4-20260305 · 111,909 tokens}