Update dependency golang to v1.26.5 (release-v0.8)

[renovate]

This PR contains the following updates:

Package	Update	Change
golang	minor	1.25.7 → 1.26.5

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Release Notes

golang/go (golang)

v1.26.5

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v1.26.4

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v1.26.3

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v1.26.2

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v1.26.1

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v1.26.0

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v1.25.12

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v1.25.11

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v1.25.10

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v1.25.9

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v1.25.8

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Configuration

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[fullsend-ai-review]

🤖 Finished Review · ✅ Success · Started 10:04 PM UTC · Completed 10:10 PM UTC
Commit: 7c8ccca · View workflow run →

[fullsend-ai-review]

Review of #1731 — Update dependency golang to v1.26.5 (release-v0.8)

Verdict: ✅ Approve

Summary

Mechanical version bump by Renovate: .tool-versions updates the Go toolchain from 1.25.7 → 1.26.5. Single-line, value-only change with no code, test, or configuration modifications.

Analysis

Dimension	Result
Correctness	✅ No issues. Go 1.26.5 is backward-compatible with the go 1.25.5 directive in go.mod. Sub-module toolchain go1.25.7 directives specify minimums that 1.26.5 satisfies.
Security	✅ No secrets, injection patterns, or permission changes.
Intent & coherence	✅ Mechanical dependency bump — scope authorization implicit.
Style & conventions	✅ Value follows existing <tool> <version> pattern.
Documentation	✅ No documentation references the specific Go version 1.25.7.
Cross-repo contracts	⏭ Skipped — no exported interfaces modified.

No findings above the severity threshold.