docs(NODE-7768): align with team practices

[johnmtll]

Description

Summary of Changes

After team discussions in mongodb/js-bson#915, some additional features were onboarded when considering agentic development. These changes mirror the additions added in the aforementioned PR.

Notes for Reviewers

What is the motivation for this change?

Release Highlight

Release notes highlight

Double check the following

• Lint is passing (npm run check:lint)
• Self-review completed using the steps outlined here
• PR title follows the correct format: type(NODE-xxxx)[!]: description
  • Example: feat(NODE-1234)!: rewriting everything in coffeescript
• Changes are covered by tests
• New TODOs have a related JIRA ticket

[Copilot]

Pull request overview

This PR aligns the repo with team agentic-development practices by formalizing how AGENTS.md/CLAUDE.md references are kept in sync and by adding automated enforcement via a Git pre-commit hook.

Changes:

• Add a .githooks/pre-commit hook that runs scripts/symlink-claude-md.sh.
• Add an npm prepare script to configure core.hooksPath to use .githooks.
• Update documentation and agent guidelines (README + AGENTS.md) and annotate the vendored script.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
scripts/symlink-claude-md.sh	Adds vendoring notice header for the sync script.
README.md	Updates contributor steps for staging AGENTS.md before generating CLAUDE.md, and notes the script is vendored.
package.json	Adds prepare hook to set core.hooksPath to .githooks.
AGENTS.md	Clarifies Conventional Commits expectations for PR descriptions vs. squashed commits.
.githooks/pre-commit	Introduces a pre-commit hook to run the AGENTS.md/CLAUDE.md sync script automatically.

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