TreeMembership was enforced on every read/write but had no API or UI to manage
members — trees were effectively single-user, breaking full-CRUD (NN#8).
Backend (/trees/{id}/members): list (members only — the list exposes emails, so
non-members never see it, even on public trees); add an existing user by email
(owner only, 404 if no such account, 409 if already a member); PATCH role;
DELETE. A tree must always keep ≥1 owner (demote/remove of the sole owner → 409).
All changes audited.
Frontend: a Members page (owner gets add-by-email + per-member role select +
remove; others see a read-only list) and a sidebar entry.
Test covers the full lifecycle + every guard. Suite 77 passed.
Closes#145
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Signed-off-by: Justin Paul <justin@jpaul.me>
justin
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