dev: add imports to manage-db script

[marksvc]

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Code passed to manage-db can need fs, os, and path. This patch imports them and helps them stick around without being auto-removed by lint rules.

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This change is 

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 1 additional finding.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.34%. Comparing base (b1fa3eb) to head (e87826a).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3772   +/-   ##
=======================================
  Coverage   81.34%   81.34%           
=======================================
  Files         622      622           
  Lines       39202    39202           
  Branches     6396     6396           
=======================================
  Hits        31889    31889           
  Misses       6326     6326           
  Partials      987      987           

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[RaymondLuong3]

@RaymondLuong3 reviewed 1 file and all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on marksvc).

[devin-ai-integration]

Devin Review found 1 new potential issue.

View 1 additional finding in Devin Review.

[devin-ai-integration]

🟡 Dummy variable names _a, _b, _c are meaningless and violate naming conventions

The variables _a, _b, _c at scripts/db_tools/manage-db.ts:57-59 are used to prevent tree-shaking of the fs, os, and path imports so they remain available in eval code. However, these names convey no information about what they hold or why they exist. Per REVIEW.md: "Pay particular attention to how accurate and precise the names of methods, variables, and other named entities are." Per AGENTS.md: "It is better to write code that is verbose and understandable than terse and concise." These should be named something descriptive like _fs, _os, _path so a reader immediately understands both what module they reference and that they are intentionally unused aliases.

Suggested change

	const _a = fs;
	const _b = os;
	const _c = path;
	const _fs = fs;
	const _os = os;
	const _path = path;

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