upgrade to go 1.25.6

[sawka]

No description provided.

[coderabbitai]

Walkthrough

This PR upgrades the Go toolchain version from 1.24.x (1.24 or 1.24.6) to 1.25.6 across the codebase. The changes include 5 GitHub Actions workflow files where the GO_VERSION environment variable is updated, 10 go.mod files (root, tsunami/, and tsunami/demo/* submodules), and 1 go.mod template file. Each file receives a single-line update modifying only the Go version directive. No dependencies, logic, or functional behavior are modified.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	No pull request description was provided by the author; this is a very lenient check that only fails if completely off-topic.	Consider adding a brief description explaining the rationale for upgrading Go or any compatibility notes for reviewers.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The pull request title 'upgrade to go 1.25.6' accurately and directly describes the main change across all 14 modified files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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