docs/decisions.md: v1 ledger seeded

docs/decisions.md

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+# Decisions (append-only)
+
+Format: date · decision · why. Add at the bottom. Never edit an old entry; supersede it with a new one.
+
+## Standing rules
+- Prod is the cloud instance at teahub.xyz. The Mac (hb-5) is the operator's playground and the archive of the old factory; prod never depends on it.
+- No secrets on prod beyond: Gitea's own keys, the GitHub OAuth client, the MCP's OAuth client. Adding one is a decision.
+- Every agent acts as itself (its own Gitea login). No service tokens.
+- Port pieces from the old instance only when a card needs them, after reading them, one piece per commit, logged in docs/rebuild.md.
+
+## Ledger
+- 2026-10-14 · **Green Tea v1 is a fresh prod, not a migration.** Nothing copied from hb-5 (no issues, labels, secrets, tokens). Why: the old factory was scaffolding; the rebuild is the portability test, and chai gets a box with no dev cruft.
+- 2026-10-14 · **GitHub-backed Gitea on Fly.** Gitea stays (ownership, a place for chai to be admin); GitHub is upstream for Time and the first login. Why: Time is GitHub-native and already works; Gitea is cheap to run and keeps the sovereignty option.
+- 2026-10-14 · **Logins: GitHub now, nostr next.** Auto-registration from GitHub; no local sign-up. Why: one click for collaborators; nostr gives agents and anyone else a key-based identity (see well-known.online).
+- 2026-10-14 · **Tea MCP is off the Mac.** New Green Tea MCP on Fly, OAuth against prod Gitea, every tool as the caller. Why: the MCP is the product surface; it should be reachable without the operator's machine and must never outrun the caller's permissions.
+- 2026-10-14 · **Boring stays on the Mac.** It is the operator's admin lane, not a prod component. Why: the thing that can repair prod and the thing that runs prod are different boxes with different owners.
+- 2026-10-14 · **Codex is not installed on prod.** Seats are API-driven (Claude API, Venice); Codex on demand as a Fly Sprite. Why: no resident credentials on the runner.
+- 2026-10-14 · **Fly cost accepted** for prod (two small apps). Same category as Venice credit.
+- 2026-10-14 · **Mac runners reversed.** Last week's move of runners onto hb-5 is undone on purpose (portability exercise).
+- 2026-10-14 · **Venture loop on teahubxyz/time paused** until the audit's remaining items are judged safe (3 criticals + 3 highs fixed in time#45, #46).
+- 2026-10-14 · **well-known.online is a separate product**, not a Teahub component; may later be prod's signup front door. No dependency either way.