fix(docs): add references frontmatter to documentation files

[critesjosh]

Summary

• Adds references frontmatter to 28 documentation files that include code snippets via #include_code macros
• Creates helper script docs/scripts/extract_references.sh to extract references from documentation files
• Updates check_doc_references.sh to support directory references with /* suffix
• Updates docs/README.md with documentation about the references format
• Updates docs/CLAUDE.md with reminder about updating docs when changing processes
• Enables automatic DevRel review notifications when referenced source files change in PRs

Files Updated

Category	Count	Files
Contract Tutorials	2	counter_contract.md, token_contract.md
JS Tutorials	2	aztecjs-getting-started.md, token_bridge.md
Framework Documentation	18	Various aztec-nr/ files
Foundational Topics	6	transactions.md, state_management.md, wallets.md, fees.md, call_types.md, keys.md

How It Works

Documentation files can now declare source code dependencies via frontmatter:

---
title: Counter Contract
references: ["docs/examples/contracts/counter_contract/src/main.nr"]
---

Directory references use /* suffix to indicate all files within that directory:

references: ["noir-projects/aztec-nr/aztec/src/context/*"]

When any file within that directory changes, the documentation will be flagged for review.

When referenced paths change in a PR, docs/scripts/check_doc_references.sh:

1. Requests @AztecProtocol/devrel as reviewers
2. Posts a PR comment listing affected documentation

Reference Format

• Individual files: "path/to/file.ts"
• Directories (all files within): "path/to/directory/*"

Test Plan

• All 28 documentation files have references frontmatter
• All referenced paths (files and directories) verified to exist
• Script logic tested for both file and directory matching
• Documentation updated in README.md and CLAUDE.md

🤖 Generated with Claude Code

[sklppy88]

i like auto including the include codes, although now im thinking a possible further improvement is have the frontmatter references able to reference specific lines (kind of like how include code does it). just a thing to flag and think about later