chore: simplify dependabot grouping and weekly schedule

[charliecreates]

Summary

• simplify Dependabot grouping configuration
• set Dependabot updates to a weekly schedule for reduced PR noise

Resolves #365

✨ PR Description

Purpose: Simplify Dependabot configuration by removing granular package grouping and standardizing weekly schedules with consistent timing across ecosystems.

Main changes:

• Removed 6 specific npm dependency groups (Microsoft, commitlint, semantic-release, vitest, biome, zod) in favor of simple production/development grouping
• Added standardized weekly schedule (Monday 09:00 UTC) and open-pull-requests limits (3 for npm, 2 for actions) to both ecosystems
• Replaced 3 github-actions groups with single all-actions wildcard pattern for simplified dependency batching

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[gitstream-cm]

✨ PR Review

LGTM

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.36%. Comparing base (3550df2) to head (042e3d6).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #366   +/-   ##
=======================================
  Coverage   71.36%   71.36%           
=======================================
  Files          18       18           
  Lines         674      674           
  Branches      202      202           
=======================================
  Hits          481      481           
  Misses        110      110           
  Partials       83       83           

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[greptile-apps]

Greptile Summary

This PR simplifies Dependabot update grouping and scheduling. The main changes are:

• Groups npm updates by production and development dependency type.
• Groups all GitHub Actions updates into one Dependabot group.
• Runs both ecosystems weekly on Monday at 09:00 UTC.
• Adds open PR limits for npm and GitHub Actions updates.

Confidence Score: 5/5

The change is limited to Dependabot configuration and is safe to merge.

The configuration-only update has a narrow scope, no code execution path changes, and no review findings were identified.

T-Rex Logs

What T-Rex did

• T-Rex parsed the base dependabot config from trex-artifacts/dependabot-config-01-before.log to capture the initial state with 2 updates and the original npm and github-actions groupings.
• T-Rex parsed the head dependabot config from trex-artifacts/dependabot-config-02-after.log to capture the updated state with 2 updates and simplified groupings, weekly schedules, and updated PR limits.
• T-Rex generated a diff between the base and head configs and saved it to trex-artifacts/dependabot-config-diff.log, showing changes to grouping, scheduling, and limit fields.

_{Ran code and verified through T-Rex}

_{Reviews (1): Last reviewed commit: "chore: simplify dependabot grouping and ..." | Re-trigger Greptile}