fix(brain-repo): secrets_scanner silently fails to import on Python 3.9

[mt-alarcon]

Summary

secrets_scanner.py uses PEP 604 union syntax (list[str] | None) in
function signatures. Without from __future__ import annotations,
this syntax raises TypeError at import time on Python 3.9 —
still a common interpreter (e.g. /usr/bin/python3 ships 3.9.x on
macOS).

The dangerous part: any caller that wraps the import/scan call in a
broad try/except and falls back to an empty result set on failure
loses secret-scanning coverage silently — no error surfaced to the
user, no log noise, just an empty findings list. That's the exact
failure mode a secret scanner exists to prevent, and it's entirely
dependent on which Python interpreter happens to be on PATH.

Fix

One line: add from __future__ import annotations at the top of the
module, so annotations are evaluated lazily as strings. No behavior
change on 3.10+, restores compatibility with 3.9.

Test plan

• /usr/bin/python3 --version → Python 3.9.6
• Before fix: import brain_repo.secrets_scanner under 3.9.6 raises
  TypeError: unsupported operand type(s) for |: 'type' and 'NoneType'
• After fix: same import succeeds under 3.9.6
• Existing module test suite (111 tests) still passes under the
  project's normal Python 3.11 environment

🤖 Generated with Claude Code

Summary by Sourcery

Bug Fixes:

• Prevent import-time TypeError in secrets_scanner on Python 3.9 due to use of PEP 604 union syntax without postponed evaluation of annotations.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Ensures the secrets scanner module imports correctly on Python 3.9 by making type annotations lazily evaluated, preventing silent failures in secret scanning due to PEP 604 union syntax incompatibility.

File-Level Changes

Change	Details	Files
Make type annotations lazily evaluated to restore Python 3.9 compatibility and prevent import-time TypeError in the secrets scanner module.	Add future import to enable postponed evaluation of type annotations that use PEP 604 union syntax Rely on the unchanged runtime behavior for Python 3.10+ while fixing import behavior on Python 3.9	dashboard/backend/brain_repo/secrets_scanner.py

---

Tips and commands

Interacting with Sourcery

• Trigger a new review: Comment @sourcery-ai review on the pull request.
• Continue discussions: Reply directly to Sourcery's review comments.
• Generate a GitHub issue from a review comment: Ask Sourcery to create an
  issue from a review comment by replying to it. You can also reply to a
  review comment with @sourcery-ai issue to create an issue from it.
• Generate a pull request title: Write @sourcery-ai anywhere in the pull
  request title to generate a title at any time. You can also comment
  @sourcery-ai title on the pull request to (re-)generate the title at any time.
• Generate a pull request summary: Write @sourcery-ai summary anywhere in
  the pull request body to generate a PR summary at any time exactly where you
  want it. You can also comment @sourcery-ai summary on the pull request to
  (re-)generate the summary at any time.
• Generate reviewer's guide: Comment @sourcery-ai guide on the pull
  request to (re-)generate the reviewer's guide at any time.
• Resolve all Sourcery comments: Comment @sourcery-ai resolve on the
  pull request to resolve all Sourcery comments. Useful if you've already
  addressed all the comments and don't want to see them anymore.
• Dismiss all Sourcery reviews: Comment @sourcery-ai dismiss on the pull
  request to dismiss all existing Sourcery reviews. Especially useful if you
  want to start fresh with a new review - don't forget to comment
  @sourcery-ai review to trigger a new review!

Customizing Your Experience

Access your dashboard to:

• Enable or disable review features such as the Sourcery-generated pull request
  summary, the reviewer's guide, and others.
• Change the review language.
• Add, remove or edit custom review instructions.
• Adjust other review settings.

Getting Help

• Contact our support team for questions or feedback.
• Visit our documentation for detailed guides and information.
• Keep in touch with the Sourcery team by following us on X/Twitter, LinkedIn or GitHub.

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

---

Sourcery is free for open source - if you like our reviews please consider sharing them ✨

• X
• Mastodon
• LinkedIn
• Facebook

_{Help me be more useful! Please click 👍 or 👎 on each comment and I'll use the feedback to improve your reviews.}