feat(P01): SLICE-05 operator bootstrap CLI + secrets scope

- TASK-05-01 scripts/create-operator.py: CLI that reads
  PRAXIS_BOOTSTRAP_OPERATOR_USER/PASS + PRAXIS_PG_DSN from env, creates
  the pool, applies migrations, hashes the password with argon2id, and
  INSERTs with ON CONFLICT DO NOTHING (idempotent — D-052). --update
  flag forces rehash + ON CONFLICT DO UPDATE. Missing env → exit 1
  (R-BOOT-02). Connection failure → 3x retry with 5s backoff (R-BOOT-01).
- TASK-05-02 .ciagent/config.json: added "operator" secrets scope
  (PRAXIS_PG_PASSWORD, PRAXIS_COOKIE_SECRET,
  PRAXIS_BOOTSTRAP_OPERATOR_USER/PASS, PRAXIS_VC_ISSUER_KEY).
  .ciagent/.env.secrets.example: template (committed, no real secrets).
  .gitignore: added negations so .env.secrets.example is tracked while
  .env.secrets stays ignored.
- TASK-05-03 tests/test_create_operator.py: 7 tests (mocked PgStore) —
  create, already-exists (no update), --update rehashes, missing env →
  exit 1, password is argon2id (not plaintext).

---ci---
project: praxis
phase: 1
milestone: v0.4
status: execute
persona: devops-engineer
task: 05-01,05-02,05-03
requirements:
  covered: [REQ-AUTH-01]
---/ci---

scripts/create-operator.py

@@ -0,0 +1,106 @@
+#!/usr/bin/env python3
+"""Praxis v0.4 — Operator bootstrap CLI (TASK-05-01, D-052).
+
+Creates the initial operator from env-provided credentials. Idempotent
+(ON CONFLICT DO NOTHING). The --update flag forces a rehash + update.
+
+Env:
+  PRAXIS_BOOTSTRAP_OPERATOR_USER  — operator username (required)
+  PRAXIS_BOOTSTRAP_OPERATOR_PASS  — operator password (required)
+  PRAXIS_PG_DSN                   — Postgres DSN (required)
+
+Exit: 0 on success (created or already-exists), 1 on missing env / DB error.
+Retries on connection failure (3 attempts, 5s backoff — R-BOOT-01).
+
+Run:
+  PRAXIS_BOOTSTRAP_OPERATOR_USER=admin PRAXIS_BOOTSTRAP_OPERATOR_PASS=... \
+  PRAXIS_PG_DSN=postgresql://praxis:...@postgres:5432/praxis \
+  python3 scripts/create-operator.py
+"""
+
+from __future__ import annotations
+
+import argparse
+import asyncio
+import os
+import sys
+
+from argon2 import PasswordHasher
+
+_ph = PasswordHasher()
+_RETRY_ATTEMPTS = 3
+_RETRY_BACKOFF_S = 5.0
+
+
+async def create_operator(update: bool = False) -> int:
+    user = os.environ.get("PRAXIS_BOOTSTRAP_OPERATOR_USER", "").strip()
+    pw = os.environ.get("PRAXIS_BOOTSTRAP_OPERATOR_PASS", "")
+    dsn = os.environ.get("PRAXIS_PG_DSN", "").strip()
+    if not user or not pw:
+        print(
+            "create-operator: ERROR — PRAXIS_BOOTSTRAP_OPERATOR_USER and "
+            "PRAXIS_BOOTSTRAP_OPERATOR_PASS must be set (R-BOOT-02).",
+            file=sys.stderr,
+        )
+        return 1
+    if not dsn:
+        print(
+            "create-operator: ERROR — PRAXIS_PG_DSN must be set.",
+            file=sys.stderr,
+        )
+        return 1
+
+    import asyncpg
+    from db.pg_migrate import apply_pg_migrations
+    from db.pg_store import PgStore
+
+    last_exc: Exception | None = None
+    for attempt in range(1, _RETRY_ATTEMPTS + 1):
+        try:
+            pool = await asyncpg.create_pool(
+                dsn=dsn, min_size=1, max_size=3, command_timeout=10
+            )
+            try:
+                await apply_pg_migrations(pool)
+                store = PgStore(pool)
+                pw_hash = _ph.hash(pw)
+                display = user
+                oid = await store.insert_operator(
+                    user, pw_hash, display, on_conflict_update=update
+                )
+                if update:
+                    print(f"create-operator: updated operator {user!r} (id={oid})")
+                elif oid is not None:
+                    print(f"create-operator: created operator {user!r} (id={oid})")
+                else:
+                    print(f"create-operator: operator {user!r} already exists (no change)")
+                return 0
+            finally:
+                await pool.close()
+        except (asyncpg.PostgresConnectionError, ConnectionError, OSError) as exc:
+            last_exc = exc
+            if attempt < _RETRY_ATTEMPTS:
+                print(
+                    f"create-operator: connection attempt {attempt} failed "
+                    f"({exc}); retrying in {_RETRY_BACKOFF_S}s (R-BOOT-01)...",
+                    file=sys.stderr,
+                )
+                await asyncio.sleep(_RETRY_BACKOFF_S)
+            continue
+    print(f"create-operator: ERROR — could not connect after {_RETRY_ATTEMPTS} "
+          f"attempts: {last_exc}", file=sys.stderr)
+    return 1
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser(description="Create the initial Praxis operator.")
+    parser.add_argument(
+        "--update", action="store_true",
+        help="Force rehash + update if the operator already exists.",
+    )
+    args = parser.parse_args()
+    return asyncio.run(create_operator(update=args.update))
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())