Grants that outlive what they name, and a rule you can read

sharing.forget_principal has existed since shares did, documented as the thing
that stops a recycled id inheriting somebody's grant, and was called by nobody.
Deleting a group left every grant naming it; deleting an account left both the
grants to it and the grants of its own work -- that second half is the one
nothing else could catch, since their rows cascade and the shares of those rows
have nothing to cascade from. Both now run before the delete, while the rows are
still findable, and a deleted resource forgets its own.

library.share defaulted to False, which meant sharing shipped documented as done
and unreachable: the panel only renders for somebody holding it, so out of the
box nobody could share anything and nothing said why. It is on.

The panel itself was checkboxes inside the resource's *save form*, listing every
group and every account on the instance, unpaginated, on every detail page -- and
a tick only took effect if you also saved the resource. It is its own routes now:
search, one grant per POST, the panel re-rendered from what is stored. Anything
already shared stays listed whatever the search says, or removing a grant would
mean searching for the name it was given to.

Reports join the shareable set and memories still do not: a finished piece of
work is the thing somebody most wants to hand over, and a record about a person
is not content to pass round. reports.visible became sharing.visible_to, which is
the one line its own docstring predicted. Two things fell out: `owned` beside
`get`, because sharing grants reading and deleting is the owner's alone; and
reading somebody else's report no longer clears their unread dot.

Permissions gained the answer to "what can this person actually do?" --
explain() is resolve()'s working shown rather than thrown away, naming admin, the
baseline, or the groups that granted each one. That is the simulation the union
rule exists to make unnecessary, and until now the only way to get it was to open
every group and read the grids by eye. Users and groups are list-plus-detail, and
membership is edited from one side: it was on both, and a full-form POST from
either overwrote what the other had shown.

Read and write are split for notes, memory and skills -- checked on the tool's
declared risk, after the gate so it can only narrow, and defaulting on.

Quotas are the union rule applied to numbers, with the corner that makes it
interesting: zero means "no limit" and wins outright, or a group saying unlimited
would count for less than one saying a million. Absent means "no opinion".
_narrower folds a group's ceiling with the instance's and is deliberately not
min, for the same reason. Five axes, enforced where each is knowable -- before a
reply is built, before a second one starts, on an agent reply's clock, before a
minute of GPU, and beside the helper cap -- and usage is recorded even for a
reply that was stopped or errored, because an endpoint charges either way.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

src/lembas/web/templates/admin/groups.html

@@ -1,5 +1,5 @@
 {% extends "admin/_layout.html" %}
-{% from "_macros.html" import icon, model_avatar %}
+{% from "_macros.html" import icon %}
 {% set section = "groups" %}
 
 {% block title %}Groups & permissions - {{ brand.name }}{% endblock %}
@@ -9,8 +9,9 @@
 <p class="admin-lede">
   Permissions are a <strong>union</strong>: everyone starts with the baseline
   below, and each group they belong to can add more. A group never takes
-  something away, so being in a second group can only widen what someone can do.
-  Administrators bypass all of it.
+  something away, so being in a second group can only widen what someone can do —
+  which is what keeps “why can this person not do X?” answerable without
+  simulating every group they are in. Administrators bypass all of it.
 </p>
 
 {% if saved %}
@@ -19,7 +20,7 @@
 
 <section class="card">
   <h2 class="card__title">Baseline permissions</h2>
-  <p class="text-sm muted" style="margin-bottom: var(--sp-4)">
+  <p class="card__lede">
     What every signed-in user can do before any group is considered. Turn
     something off here and grant it through a group to make it opt-in.
   </p>
@@ -48,7 +49,39 @@
   Groups <span class="badge">{{ groups|length }}</span>
 </h2>
 
-<section class="card">
+{#
+  Rows, not a form each. The old page rendered every group's full permission
+  grid, every member and every model on one screen -- fine for two groups and
+  unreadable at ten, which is the list-plus-detail rule the model admin already
+  follows.
+#}
+<div class="model-rows">
+  {% for group in groups %}
+  <a class="model-row" href="/admin/groups/{{ group.id }}">
+    <div class="model-row__main">
+      <span class="model-row__name">{{ group.name }}</span>
+      {% if group.description %}
+      <span class="model-row__id">{{ group.description }}</span>
+      {% endif %}
+    </div>
+    <div class="model-row__meta">
+      <span class="badge">{{ group.users | length }} member{{ '' if group.users|length == 1 else 's' }}</span>
+      {% if granted[group.id] %}
+      <span class="badge badge--leaf">+{{ granted[group.id] }} permission{{ '' if granted[group.id] == 1 else 's' }}</span>
+      {% endif %}
+      {% if group.limits_json %}<span class="badge">quotas</span>{% endif %}
+    </div>
+  </a>
+  {% else %}
+  <div class="empty" style="padding: var(--sp-8) 0">
+    <p class="empty__text">
+      No groups yet. Everybody gets the baseline above and nothing more.
+    </p>
+  </div>
+  {% endfor %}
+</div>
+
+<section class="card" style="margin-top: var(--sp-6)">
   <form method="post" action="/admin/groups" class="btn-row">
     <input class="input" name="name" placeholder="New group name" required
            aria-label="New group name">
@@ -57,114 +90,4 @@
     </button>
   </form>
 </section>
-
-{% if not groups %}
-<div class="empty" style="padding: var(--sp-8) 0">
-  {{ icon("users", "empty__mark") }}
-  <p class="empty__text">
-    No groups yet. Create one to grant extra permissions, or to restrict a model
-    to a subset of users.
-  </p>
-</div>
-{% endif %}
-
-{% for group in groups %}
-<section class="card">
-  <form method="post" action="/admin/groups/{{ group.id }}">
-    <div class="card__header">
-      <strong>{{ group.name }}</strong>
-      <span class="text-xs faint">
-        {{ group.users|length }} member{{ '' if group.users|length == 1 else 's' }},
-        {{ group.models|length }} model{{ '' if group.models|length == 1 else 's' }}
-      </span>
-    </div>
-
-    <div class="field">
-      <label class="field__label" for="gn-{{ group.id }}">Name</label>
-      <input class="input" id="gn-{{ group.id }}" name="name" value="{{ group.name }}" required>
-    </div>
-
-    <div class="field">
-      <label class="field__label" for="gd-{{ group.id }}">Description</label>
-      <input class="input" id="gd-{{ group.id }}" name="description"
-             value="{{ group.description }}" placeholder="What is this group for?">
-    </div>
-
-    <div class="field">
-      <span class="field__label">Grants</span>
-      <p class="field__hint" style="margin-bottom: var(--sp-2)">
-        Anything already in the baseline stays on regardless — these only add.
-      </p>
-      {% for section_name, defs in permission_groups.items() %}
-        {% for definition in defs %}
-        <label class="checkbox perm-row">
-          <input type="checkbox" name="permission" value="{{ definition.key }}"
-                 {{ 'checked' if (group.permissions_json or {}).get(definition.key) }}>
-          <span>
-            <strong>{{ definition.label }}</strong>
-            <span class="perm-row__desc">
-              {{ definition.description }}
-              {% if baseline[definition.key] %}<em>(already in the baseline)</em>{% endif %}
-            </span>
-          </span>
-        </label>
-        {% endfor %}
-      {% endfor %}
-    </div>
-
-    <div class="field">
-      <span class="field__label">Members</span>
-      {% if users %}
-      <div class="checkbox-row">
-        {% for account in users %}
-        <label class="checkbox">
-          <input type="checkbox" name="user_ids" value="{{ account.id }}"
-                 {{ 'checked' if account in group.users }}>
-          <span>{{ account.name }}</span>
-        </label>
-        {% endfor %}
-      </div>
-      {% else %}
-      <p class="field__hint">No users yet.</p>
-      {% endif %}
-    </div>
-
-    <div class="field">
-      <span class="field__label">Model access</span>
-      <p class="field__hint" style="margin-bottom: var(--sp-2)">
-        Models marked “available to everyone” are reachable regardless. These
-        grant access to the restricted ones.
-      </p>
-      {% if models %}
-      <div class="checkbox-row">
-        {% for model in models %}
-        <label class="checkbox {{ 'is-muted' if model.public }}">
-          <input type="checkbox" name="model_ids" value="{{ model.id }}"
-                 {{ 'checked' if model in group.models }}>
-          <span>{{ model.label }}{% if model.public %} <em>(public)</em>{% endif %}</span>
-        </label>
-        {% endfor %}
-      </div>
-      {% else %}
-      <p class="field__hint">No models yet.</p>
-      {% endif %}
-    </div>
-
-    <div class="btn-row">
-      <button class="btn btn--primary" type="submit">Save {{ group.name }}</button>
-    </div>
-  </form>
-
-  <div class="card__footer">
-    <span class="text-xs faint">Deleting a group leaves its members alone.</span>
-    <form method="post" action="/admin/groups/{{ group.id }}/delete"
-          data-confirm="Delete the group “{{ group.name }}”? Its members keep their accounts."
-          data-confirm-title="Delete group">
-      <button class="btn btn--sm btn--danger" type="submit">
-        {{ icon("trash", "icon--sm") }} Delete
-      </button>
-    </form>
-  </div>
-</section>
-{% endfor %}
 {% endblock %}