Merge remote-tracking branch 'origin/staging' into feat/workspace-metadata-versioning-patch

# Conflicts:
#	src/agent/heartbeat.rs
#	src/db/libsql_migrations.rs

migrations/V14__users.sql

@@ -0,0 +1,31 @@
+-- User management tables for multi-tenant deployments.
+--
+-- Replaces the static GATEWAY_USER_TOKENS env var with DB-backed
+-- user registration, API token management, and invitation flow.
+
+CREATE TABLE users (
+    id TEXT PRIMARY KEY,                        -- matches existing user_id pattern (string, not UUID)
+    email TEXT UNIQUE,                          -- nullable for token-only users
+    display_name TEXT NOT NULL,
+    status TEXT NOT NULL DEFAULT 'active',       -- active | suspended | deactivated
+    role TEXT NOT NULL DEFAULT 'member',          -- admin | member
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    last_login_at TIMESTAMPTZ,
+    created_by TEXT REFERENCES users(id),       -- who invited this user (nullable for bootstrap)
+    metadata JSONB NOT NULL DEFAULT '{}'        -- extensible profile data
+);
+
+CREATE TABLE api_tokens (
+    id UUID PRIMARY KEY,
+    user_id TEXT NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    token_hash BYTEA NOT NULL,                  -- SHA-256 hash (never store plaintext)
+    token_prefix TEXT NOT NULL,                 -- first 8 hex chars for display
+    name TEXT NOT NULL,                         -- human label ("my-laptop", "ci-bot")
+    expires_at TIMESTAMPTZ,                     -- nullable = never expires
+    last_used_at TIMESTAMPTZ,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    revoked_at TIMESTAMPTZ                      -- soft-revoke: set this instead of deleting
+);
+CREATE INDEX idx_api_tokens_user ON api_tokens(user_id);
+CREATE INDEX idx_api_tokens_hash ON api_tokens(token_hash);