ci: keep profile assets synchronized

[parvbansal11]

Outcome

Keeps the focused organization profile aligned with the canonical GraphABI brand assets.

• Checks the profile animation and light and dark wordmarks byte-for-byte against the generated core assets.
• Checks out the public core repository during profile CI so drift fails before merge.
• Adds grouped weekly updates for pinned GitHub Actions.

Verification

• Profile content and link contract: passed
• Canonical asset synchronization: passed
• No-em-dash and private-path hygiene: passed
• Dependabot configuration: valid YAML

No organization profile copy or product claim changed.