chore(web): Store pushedAt field in Repo table

[brendan-kellam]

This PR adds the pushedAt date field in the Repo table that tracks when the repo was last pushed to, across all branches.

Related #511

Summary by CodeRabbit

• New Features

  • Repositories now track the timestamp of the most recent commit across all branches for improved visibility.

• Documentation

  • Added development guidelines for database migrations and package building procedures.

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[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

This PR adds a new pushedAt field to the Repo table to track the timestamp of the most recent commit across all branches. Changes include a database migration and schema update, a new git utility function to fetch the latest commit timestamp, integration into the repository indexing workflow, and documentation updates.

Changes

Cohort / File(s)	Summary
Database Schema Changes packages/db/prisma/schema.prisma, packages/db/prisma/migrations/20260124232658_add_pushed_at_to_repo/migration.sql	Added pushedAt DateTime? field to Repo model; migration adds TIMESTAMP(3) column to repository table
Git Utilities packages/backend/src/git.ts	New exported async function getLatestCommitTimestamp() that executes git log --all -1 --format=%aI to retrieve the most recent commit timestamp across all branches, with error handling and fallback to undefined on failure
Repository Indexing packages/backend/src/repoIndexManager.ts	Updated imports to include getLatestCommitTimestamp; integrated function calls into index completion and post-INDEX job workflows to compute and persist pushedAt alongside existing metadata
Documentation CHANGELOG.md, CLAUDE.md	CHANGELOG entry documenting new pushedAt field; CLAUDE.md introduces development guidelines for Prisma migrations and package building

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Suggested reviewers

• msukkari

✨ Finishing touches

• 📝 Generate docstrings

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