feat(review-hog): randomize clean review media

[pauldambra]

Problem

Why: Clean ReviewHog runs always show the same GIF. A small media pool keeps the reward varied and makes future additions straightforward without growing the main repository.

Changes

• Randomly select from two GIFs and an optimized dog image.
• Store all assets in the public asset repository behind permanent SHA-pinned URLs.

How did you test this code?

• uv run pytest -q products/review_hog/backend/tests/test_status_comment.py::TestRenderFinalBody (6 passed). The new case catches regressions where the selected media URL and alt text are not rendered.
• ruff check and hogli ci:preflight --fix passed.
• The full status-comment test file reached 10 passing tests, but its 8 database-backed tests could not start because Postgres was unavailable in this environment.

👉 Stay up-to-date with PostHog coding conventions for a smoother review.

Automatic notifications

• Publish to changelog?
• Alert Sales and Marketing teams?

Docs update

No docs update is needed. This only varies the media in an existing GitHub status comment.

🤖 Agent context

Autonomy: Human-driven (agent-assisted)

PostHog Code (Codex) implemented the change and used the /writing-tests skill to keep coverage focused on the observable rendered comment. The supplied dog image was reduced from 3.9 MB to 141 KB. The supplied panda GIF was reduced from 2.1 MB to 576 KB while preserving its animation. The main repository stores only their pinned URLs.

---

Created with PostHog Code

[trunk-io]

😎 This pull request was merged.

[github-actions]

Hey @pauldambra! 👋

It looks like your git author email on this PR isn't your @posthog.com address (paul.dambra@gmail.com). Since you're on the PostHog team, it's worth pointing your local git author email at your @posthog.com address. Why it matters:

• Consistent work identity in git history — internal tooling that attributes commits to team members keys off your @posthog.com address.
• Keeps team contributions easy to tell apart from external community ones when scanning history.

You can fix it for this repo with:

git config user.email "you@posthog.com"

Or set it globally with git config --global user.email "you@posthog.com". No need to redo this PR — just a nudge for next time. 🙂

[stamphog]

Low-risk, contained change swapping a single hardcoded GIF for a random pick among three pinned static assets in a status-comment renderer; diff matches description, has test coverage, and carries a current-head approval.

• andrewm4894 reviewed the current head.

Gate mechanics and policy version

Gate		Result
prerequisites	✓	all clear
deny-list	✓	no deny categories matched
size	✓	30L, 1F substantive, 46L/2F incl. docs/generated/snapshots — within ceiling
tier	✓	T1-agent / T1b-small (46L, 2F, single-area, feat)
stamphog 2.0.0b3		.stamphog/policy.yml @ 53b7152 · reviewed head 9ff7d6c

[deployment-status-posthog]

Deploy status

Environment	Status	Deployed At	Workflow
dev	✅ Deployed	2026-07-22 23:41 UTC	Run
prod-us	✅ Deployed	2026-07-22 23:57 UTC	Run
prod-eu	✅ Deployed	2026-07-22 23:59 UTC	Run