fix(renovate): run go mod tidy on dependency updates

[prskr]

Summary

Three open Renovate PRs (#136 gofumpt, #138 x/crypto, #139 x/tools) are failing CI with go tool gotestsum: missing go.sum entry errors that are unrelated to their actual dependency bumps.

Root cause: renovate.json doesn't set postUpdateOptions: ["gomodTidy"], so Renovate only patches go.sum entries for the module it bumped rather than running a full go mod tidy. When a bump shifts transitive versions used solely by the go.mod tool(...) block (gotestsum, gofumpt, goimports) — which aren't in the main dependency graph go mod download walks — go.sum ends up missing entries for their own indirect dependencies (golang.org/x/text, x/sync, x/term, etc.), and go tool gotestsum fails at CI time.

Adding gomodTidy makes Renovate run go mod tidy after every update, keeping go.sum fully consistent (matching what a contributor running go mod tidy locally would produce).

Test plan

• Verified locally: go mod tidy on the affected branches produces a complete, consistent go.sum and go tool gotestsum then succeeds.
• This is a Renovate bot configuration change; it takes effect the next time Renovate processes the repo (rebase of an existing PR, or a new PR).

🤖 Generated with Claude Code

https://claude.ai/code/session_01KgKYpETCoqe5rCiiGaUrx5

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Reviewing files that changed from the base of the PR and between 77b446a and 7f9015f.

📒 Files selected for processing (1)

• renovate.json

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