teams: zeroclaw container coords + coding_readwrite risk profile

Slice 3a of the per-loop-team arc — prerequisites for the runtime
spawn hookup that lands in 3b:

0046 migration
- ALTER TABLE teams ADD zeroclaw_container TEXT
- ALTER TABLE teams ADD zeroclaw_gateway_url TEXT
Both NULL until the runtime's spawn_team fn (3b) provisions the
container and persists its coordinates. Mirrors the shape already on
research_topics (0038) so the resolver code path can generalize.

cm-db
- team_container_coords / set_team_container_coords: dynamic
  sqlx::query() readers/writers for the new columns.

Runtime template (gw-04, out-of-band edit on
/var/lib/clawmates-runtime-template/config.toml + shared runtime
/root/clawmates-runtime/data/.zeroclaw/config.toml)
- New [risk_profiles.coding_readwrite]: adds file_write + shell on
  top of the research_readonly baseline. Still excludes http_request /
  browser / composio (egress stays behind the MCP door).

Slice 3b will add spawn_team (bind-mounts paired-topic repo, uses
team-scoped state dir, injects team.risk_profile into the config
template) and rewire topology_worker to resolve gateway URL through
team_id when the loop has one.

crates/cm-db/src/repo/teams.rs

@@ -372,3 +372,56 @@ pub async fn set_team_for_research_topic(
         .await?;
     Ok(())
 }
+
+/// 0046: read the team's per-container coordinates. Both fields NULL
+/// means the team has never spawned; the runtime provisions on first
+/// iteration.
+pub async fn team_container_coords(
+    pool: &PgPool,
+    id: Uuid,
+    workspace_id: WorkspaceId,
+) -> Result<Option<(Option<String>, Option<String>)>, DbError> {
+    use sqlx::Row;
+    let row: Option<sqlx::postgres::PgRow> = sqlx::query(
+        "SELECT zeroclaw_container, zeroclaw_gateway_url FROM teams
+          WHERE id = $1 AND workspace_id = $2",
+    )
+    .bind(id)
+    .bind(workspace_id.as_uuid())
+    .fetch_optional(pool)
+    .await?;
+    Ok(row.map(|r| {
+        (
+            r.try_get::<Option<String>, _>("zeroclaw_container")
+                .ok()
+                .flatten(),
+            r.try_get::<Option<String>, _>("zeroclaw_gateway_url")
+                .ok()
+                .flatten(),
+        )
+    }))
+}
+
+/// 0046: set (or clear) the team's per-container coordinates once
+/// spawn_team lands them.
+pub async fn set_team_container_coords(
+    pool: &PgPool,
+    id: Uuid,
+    workspace_id: WorkspaceId,
+    container: Option<&str>,
+    gateway_url: Option<&str>,
+) -> Result<(), DbError> {
+    sqlx::query(
+        "UPDATE teams
+            SET zeroclaw_container = $3,
+                zeroclaw_gateway_url = $4
+          WHERE id = $1 AND workspace_id = $2",
+    )
+    .bind(id)
+    .bind(workspace_id.as_uuid())
+    .bind(container)
+    .bind(gateway_url)
+    .execute(pool)
+    .await?;
+    Ok(())
+}