feat(vars): admin CRUD API + pic vars CLI

Completes the vars half of Phase 3 end-to-end:
- vars_repo: VarOwner{Group|App} upsert/delete/list (owner-kind-specific
  SQL; ON CONFLICT restates the partial-index predicate).
- vars_api: GET/PUT/DELETE under /apps/{id}/vars and /groups/{id}/vars,
  resolve-then-require gated on App/GroupVars{Read,Write}, secrets-style
  error mapping + key/env-scope validation.
- pic vars ls/set/rm (--group|--app, --env, --json, --tombstone).
- journey test: a group var is inherited by a descendant app's
  vars::get(), and an app-level value overrides it (proximity) — green.

386 manager-core lib tests + the vars journey pass; clippy clean.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

crates/picloud-cli/src/client.rs

@@ -692,6 +692,54 @@ impl Client {
         decode_status(resp).await
     }
 
+    // ---------- vars (Phase 3 config) ----------
+
+    /// `GET /api/v1/admin/{apps,groups}/{id}/vars` — the owner's OWN vars
+    /// (not the resolved/inherited view).
+    pub async fn vars_list(&self, owner: VarOwnerArg<'_>) -> Result<VarListDto> {
+        let resp = self
+            .request(Method::GET, &format!("{}/vars", owner.base_path()))
+            .send()
+            .await?;
+        decode(resp).await
+    }
+
+    /// `PUT /api/v1/admin/{apps,groups}/{id}/vars`
+    pub async fn vars_set(
+        &self,
+        owner: VarOwnerArg<'_>,
+        key: &str,
+        value: serde_json::Value,
+        env: Option<&str>,
+        tombstone: bool,
+    ) -> Result<()> {
+        let mut body = serde_json::json!({ "key": key, "value": value, "tombstone": tombstone });
+        if let Some(env) = env {
+            body["env"] = serde_json::Value::String(env.to_string());
+        }
+        let resp = self
+            .request(Method::PUT, &format!("{}/vars", owner.base_path()))
+            .json(&body)
+            .send()
+            .await?;
+        decode_status(resp).await
+    }
+
+    /// `DELETE /api/v1/admin/{apps,groups}/{id}/vars/{key}`
+    pub async fn vars_delete(
+        &self,
+        owner: VarOwnerArg<'_>,
+        key: &str,
+        env: Option<&str>,
+    ) -> Result<()> {
+        let mut path = format!("{}/vars/{}", owner.base_path(), seg(key));
+        if let Some(env) = env {
+            path.push_str(&format!("?env={}", seg(env)));
+        }
+        let resp = self.request(Method::DELETE, &path).send().await?;
+        decode_status(resp).await
+    }
+
     // ---------- domains ----------
 
     /// `GET /api/v1/admin/apps/{id_or_slug}/domains`
@@ -1394,6 +1442,37 @@ pub struct DeadLetterDto {
     pub resolution: Option<String>,
 }
 
+/// Which owner a `pic vars` call targets. Selects the `apps` vs `groups`
+/// admin path prefix; the identifier travels in the path (encoded).
+#[derive(Debug, Clone, Copy)]
+pub enum VarOwnerArg<'a> {
+    App(&'a str),
+    Group(&'a str),
+}
+
+impl VarOwnerArg<'_> {
+    fn base_path(&self) -> String {
+        match self {
+            Self::App(ident) => format!("/api/v1/admin/apps/{}", seg(ident)),
+            Self::Group(ident) => format!("/api/v1/admin/groups/{}", seg(ident)),
+        }
+    }
+}
+
+#[derive(Debug, Deserialize)]
+pub struct VarListDto {
+    pub vars: Vec<VarItemDto>,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct VarItemDto {
+    pub key: String,
+    pub env: String,
+    pub value: serde_json::Value,
+    pub is_tombstone: bool,
+    pub updated_at: DateTime<Utc>,
+}
+
 #[derive(Debug, Deserialize)]
 pub struct SecretListDto {
     pub secrets: Vec<SecretItemDto>,

crates/picloud-cli/src/cmds/mod.rs

@@ -22,4 +22,5 @@ pub mod secrets;
 pub mod topics;
 pub mod triggers;
 pub mod users;
+pub mod vars;
 pub mod whoami;

crates/picloud-cli/src/cmds/vars.rs

@@ -0,0 +1,85 @@
+//! `pic vars ls | set | rm` — manage Phase-3 group/app config vars.
+//!
+//! Wraps `/api/v1/admin/{apps,groups}/{id}/vars*`. Exactly one of
+//! `--group` / `--app` selects the owner. `ls` shows the owner's OWN rows
+//! (not the resolved/inherited view). Set values are JSON strings by
+//! default; `--json` parses the value as raw JSON.
+
+use anyhow::{anyhow, Result};
+
+use crate::client::{Client, VarOwnerArg};
+use crate::config;
+use crate::output::{OutputMode, Table};
+
+/// Resolve the `--group`/`--app` pair into exactly one owner.
+fn owner<'a>(group: Option<&'a str>, app: Option<&'a str>) -> Result<VarOwnerArg<'a>> {
+    match (group, app) {
+        (Some(g), None) => Ok(VarOwnerArg::Group(g)),
+        (None, Some(a)) => Ok(VarOwnerArg::App(a)),
+        (Some(_), Some(_)) => Err(anyhow!("pass exactly one of --group / --app, not both")),
+        (None, None) => Err(anyhow!("pass one of --group / --app")),
+    }
+}
+
+pub async fn ls(group: Option<&str>, app: Option<&str>, mode: OutputMode) -> Result<()> {
+    let owner = owner(group, app)?;
+    let creds = config::resolve()?;
+    let client = Client::from_creds(&creds)?;
+    let resp = client.vars_list(owner).await?;
+    let mut table = Table::new(["key", "env", "value", "tombstone", "updated_at"]);
+    for v in resp.vars {
+        table.row([
+            v.key,
+            v.env,
+            v.value.to_string(),
+            v.is_tombstone.to_string(),
+            v.updated_at.to_rfc3339(),
+        ]);
+    }
+    table.print(mode);
+    Ok(())
+}
+
+pub async fn set(
+    group: Option<&str>,
+    app: Option<&str>,
+    key: &str,
+    value: &str,
+    env: Option<&str>,
+    as_json: bool,
+    tombstone: bool,
+) -> Result<()> {
+    let owner = owner(group, app)?;
+    let creds = config::resolve()?;
+    let client = Client::from_creds(&creds)?;
+    // A tombstone carries no value (the server stores JSON null + the
+    // deletion marker); otherwise parse per `--json`.
+    let parsed = if tombstone {
+        serde_json::Value::Null
+    } else if as_json {
+        serde_json::from_str(value).map_err(|e| anyhow!("parse value as JSON: {e}"))?
+    } else {
+        serde_json::Value::String(value.to_string())
+    };
+    client.vars_set(owner, key, parsed, env, tombstone).await?;
+    if tombstone {
+        println!("Set tombstone for {key}");
+    } else {
+        println!("Set var {key}");
+    }
+    Ok(())
+}
+
+pub async fn rm(
+    group: Option<&str>,
+    app: Option<&str>,
+    key: &str,
+    env: Option<&str>,
+) -> Result<()> {
+    let owner = owner(group, app)?;
+    let creds = config::resolve()?;
+    let client = Client::from_creds(&creds)?;
+    client.vars_delete(owner, key, env).await?;
+    println!("Deleted var {key}");
+    Ok(())
+}

crates/picloud-cli/src/main.rs

@@ -144,6 +144,14 @@ enum Cmd {
         cmd: MembersCmd,
     },
 
+    /// Config vars (Phase 3) — set / list / delete group- or app-owned
+    /// env-scoped vars. Values inherit down the group tree; an app value
+    /// overrides an inherited one (proximity wins).
+    Vars {
+        #[command(subcommand)]
+        cmd: VarsCmd,
+    },
+
     /// Files inspection — list a collection's blobs, download bytes, or
     /// delete a file. Read + delete only; writes go through scripts.
     Files {
@@ -1162,6 +1170,53 @@ enum SecretsCmd {
     },
 }
 
+#[derive(Subcommand)]
+enum VarsCmd {
+    /// List the owner's OWN vars (not the resolved/inherited view).
+    Ls {
+        /// Owning group (slug or id). Mutually exclusive with `--app`.
+        #[arg(long)]
+        group: Option<String>,
+        /// Owning app (slug or id). Mutually exclusive with `--group`.
+        #[arg(long)]
+        app: Option<String>,
+    },
+
+    /// Set a var. The value is stored as a JSON string by default; pass
+    /// `--json` to parse it as raw JSON. `--tombstone` writes a deletion
+    /// marker that suppresses an inherited key.
+    Set {
+        key: String,
+        /// Ignored (but accepted) when `--tombstone` is set.
+        #[arg(default_value = "")]
+        value: String,
+        #[arg(long)]
+        group: Option<String>,
+        #[arg(long)]
+        app: Option<String>,
+        /// Environment scope (`*` = env-agnostic, the default).
+        #[arg(long)]
+        env: Option<String>,
+        /// Parse `value` as raw JSON instead of a string literal.
+        #[arg(long)]
+        json: bool,
+        /// Write a tombstone (suppress an inherited key) instead of a value.
+        #[arg(long)]
+        tombstone: bool,
+    },
+
+    /// Delete a var by key (optionally scoped to one environment).
+    Rm {
+        key: String,
+        #[arg(long)]
+        group: Option<String>,
+        #[arg(long)]
+        app: Option<String>,
+        #[arg(long)]
+        env: Option<String>,
+    },
+}
+
 #[derive(Subcommand)]
 enum AdminsCmd {
     /// List admin accounts.
@@ -1761,6 +1816,41 @@ async fn main() -> ExitCode {
         Cmd::Members {
             cmd: MembersCmd::Rm { app, user_id },
         } => cmds::members::rm(&app, &user_id).await,
+        Cmd::Vars {
+            cmd: VarsCmd::Ls { group, app },
+        } => cmds::vars::ls(group.as_deref(), app.as_deref(), mode).await,
+        Cmd::Vars {
+            cmd:
+                VarsCmd::Set {
+                    key,
+                    value,
+                    group,
+                    app,
+                    env,
+                    json,
+                    tombstone,
+                },
+        } => {
+            cmds::vars::set(
+                group.as_deref(),
+                app.as_deref(),
+                &key,
+                &value,
+                env.as_deref(),
+                json,
+                tombstone,
+            )
+            .await
+        }
+        Cmd::Vars {
+            cmd:
+                VarsCmd::Rm {
+                    key,
+                    group,
+                    app,
+                    env,
+                },
+        } => cmds::vars::rm(group.as_deref(), app.as_deref(), &key, env.as_deref()).await,
         Cmd::Files {
             cmd:
                 FilesCmd::Ls {