chore: add dependabot.yml to repositories missing it

[jflowers]

Context

The governance scan (2026-08-21) found dependabot.yml present in only 3 of 10 repositories.

Current state:

• Have dependabot.yml: unbound-force, replicator, intake-kit
• Missing dependabot.yml: .github, gaze, dewey, website, homebrew-tap, containerfile

Action

Add a .github/dependabot.yml to each repo. Suggested template (adapt ecosystem per repo):

version: 2
updates:
  - package-ecosystem: github-actions
    directory: /
    schedule:
      interval: weekly
    commit-message:
      prefix: ci
      include: scope

  - package-ecosystem: gomod  # or npm, pip, etc.
    directory: /
    schedule:
      interval: weekly
    open-pull-requests-limit: 10
    commit-message:
      prefix: chore
      include: scope

Per-repo ecosystems:

Repo	Ecosystems
.github	github-actions, gomod
gaze	github-actions, gomod
dewey	github-actions, gomod
website	github-actions (+ framework-specific)
homebrew-tap	github-actions
containerfile	github-actions

Acceptance Criteria

• dependabot.yml present in .github
• dependabot.yml present in gaze
• dependabot.yml present in dewey
• dependabot.yml present in website
• dependabot.yml present in homebrew-tap
• dependabot.yml present in containerfile