chore: drop stale zkTrie comment + flip sample genesis useZktrie=false

[curryxbo]

Legacy zkTrie cleanup (monorepo side), companion to the go-ethereum zkTrie cleanup.

Scope

• node/core/executor.go: drop a stale snap-sync zkTrie comment.
• node/ops-morph/genesis-l2.json, genesis_geth.json: flip stale sample useZktrie:true to false (production genesis is already false).

Build

go build ./... in node/ passes.

Context

The indirect dependency scroll-tech/zktrie will drop out via go mod tidy once the upstream go-ethereum cleanup lands.
Design doc: https://larkfive.sg.larksuite.com/wiki/Qan7w367ji6qn1kU2XTlPzOagte

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes
  • Updated network configuration defaults so the relevant trie mode is now disabled in genesis settings.
  • Clarified sync-related messaging in documentation comments to better reflect current behavior.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: cf286262-7262-4816-9b5c-882d8dfe541e

📥 Commits

Reviewing files that changed from the base of the PR and between c2c67aa and 87c5e74.

📒 Files selected for processing (3)

• node/core/executor.go
• node/ops-morph/genesis-l2.json
• node/ops-morph/genesis_geth.json

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📝 Walkthrough

Walkthrough

This PR disables zkTrie by setting useZktrie to false in two genesis configuration files (genesis-l2.json and genesis_geth.json) and updates an inline comment in executor.go describing snap sync behavior, without altering any executable logic.

Changes

zkTrie Disablement

Layer / File(s)	Summary
Genesis config zkTrie toggle node/ops-morph/genesis-l2.json, node/ops-morph/genesis_geth.json	The scroll.useZktrie setting is changed from true to false in both genesis configuration files.
Executor comment update node/core/executor.go	The comment explaining why snap sync is disabled is shortened, removing the reference to Geth enabling snapshot with zkTrie; no logic changes.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Estimated code review effort

1 (Trivial) | ~3 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main changes: removing the stale zkTrie comment and flipping sample genesis useZktrie to false.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/zktrie-cleanup

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