[Merged by Bors] - chore: simplify simp/grind patterns as suggested by linter

[kim-em]

This PR removes redundant simp, simp only, and have statements before grind where grind can handle the goal directly, as suggested by the grind linter in the nightly testing run.

Addresses 6 of the 14 warnings from https://github.com/leanprover-community/mathlib4/actions/runs/21578471064

Zulip thread: https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Weekly.20linting.20log/near/571353143

The remaining warnings involve cases where the preprocessing step (norm_cast, ext, convert_to, etc.) is actually necessary for grind to succeed.

🤖 Prepared with Claude Code

[github-actions]

PR summary 20310f506a

Import changes for modified files

No significant changes to the import graph

Import changes for all files

Files	Import difference

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Declarations diff

No declarations were harmed in the making of this PR! 🐙

You can run this locally as follows

## summary with just the declaration names:
./scripts/declarations_diff.sh <optional_commit>

## more verbose report:
./scripts/declarations_diff.sh long <optional_commit>

The doc-module for script/declarations_diff.sh contains some details about this script.

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No changes to technical debt.

You can run this locally as

./scripts/technical-debt-metrics.sh pr_summary

• The relative value is the weighted sum of the differences with weight given by the inverse of the current value of the statistic.
• The absolute value is the relative value divided by the total sum of the inverses of the current values (i.e. the weighted average of the differences).

[jcommelin]

Thanks 🎉

bors merge

[mathlib-bors]

Pull request successfully merged into master.

Build succeeded:

• Post-Build Step
• Lint style
• Build