Harden Likeable billing and production readiness

[vyakymenko]

What changed

• Scoped Likeable billing to build-hour packs and extra playground slots only.
• Disabled production-project purchases before Stripe is called; legacy production metadata is recorded safely but no grant/start/notice is created.
• Disabled custom-domain endpoints with explicit 410 handoff to Fibe.
• Made playground idle sleep configurable via playground_idle_stop_hours and removed legacy production exemptions from idle-stop behavior.
• Removed production/custom-domain controls from the builder and admin UI, and hid legacy production/domain fields from project/admin diagnostics JSON.
• Removed dead production-start and custom-domain routing helpers so shared environments do not need to manage those paths.
• Updated Admin readiness/billing health, live config, preflight, README, and Help copy to position Likeable as experiments/development; production hosting, always-on runtime, custom domains, and DNS work belong in Fibe.
• Kept server guardrails for old routes/products so stale clients or old Stripe metadata fail closed instead of reviving the removed workflows.

Why

The production/custom-domain flow adds too much operational complexity for a shared Likeable environment. The safer product boundary is: Likeable sells experimentation capacity, then users move serious production/custom-domain work to Fibe.

Validation

Latest local validation on head 9e1d8b4:

• npm run lint
• npm run build
• docker run --rm -v "$PWD":/src -v /tmp/likeable-go-mod:/go/pkg/mod -v /tmp/likeable-go-build:/root/.cache/go-build -w /src golang:1.26.1-bookworm go test ./...
• bin/deploy-preflight
• git diff --check

GitHub CI:

• Deploy preflight passed on commit 9e1d8b478ad8a0326df7bd52e3cc9ea32e8947c5.

Browser/UI notes:

• Earlier browser smoke confirmed the builder no longer showed Make production or custom-domain actions, and Help showed the Fibe handoff copy.
• After the final internals cleanup, in-app Browser could not create an active pane (No active Codex browser pane available), so final verification relies on TypeScript, Go tests, deploy preflight, and the explicit diagnostics JSON hidden-field test.

Deploy notes

Deployed to Fibe playground likeable-vyakymenko / id 92 on branch feature/likeable-billing-production-deploy.

Current running image:

• playgrounds/likeable/app:9e1d8b4-b527
• public URL: https://likeable.vyakymenko.com

Live validation after rollout:

• playground status is running; redis and app are running.
• /healthz returns 200 with redis/sqlite ok.
• / and /admin/billing return 200.
• bin/live-readiness with LIKEABLE_ALLOW_BLOCKERS=1 shows billing health clear: no billing issues, hour packs 1/10/100, project slots enabled.
• Live checkout smoke creates Stripe Checkout Sessions for hour_pack and project_quota; production_project returns 410 before Stripe checkout. No payment was completed.

Known live readiness blockers are environment setup, not Likeable billing code:

• google_oauth: missing Google client id/secret.
• smtp_delivery: missing SMTP host/from email warning.