feat(meditate): Meditate's server, its sealed tables, and SimpleLogin's way back to it

halkyon_meditate_server and its generated client, copied from Todo's
and stripped to the module, the register and the sync engine (ADR 0038,
D1, D7): content_key, meditate_settings and sitting, synced and sealed,
each indexing spaceId and deleted with the person's space; two
migrations, the initial one and sittings (purely additive, the ADR
explains the SQL); ports 8280 to 8282 and PostgreSQL 8290 (D13).
Tests: the module's basics naming `meditate`, the sync engine refusing
calls without a session, the register's modes, and a person's deletion
taking their rows alone.

halkyon_base's forwarding page knows Meditate's ways back
(meditate-loopback on 43826, meditate-scheme app.halkyon.meditate),
which halkyon_app's repository names among the apps' ports.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

apps/meditate/halkyon_meditate_server/config/test.yaml

@@ -0,0 +1,51 @@
+# This is the configuration file for your test environment.
+# All ports are set to zero in this file which makes the server find the next available port.
+# This is needed to enable running tests concurrently. To set up your server, you will
+# need to add the name of the database you are connecting to and the user name.
+# The password for the database is stored in the config/passwords.yaml.
+#
+# When running your server locally, the server ports are the same as the public
+# facing ports.
+
+# Configuration for the main API test server.
+apiServer:
+  port: 0
+  publicHost: localhost
+  publicPort: 0
+  publicScheme: http
+
+# Configuration for the Insights test server.
+insightsServer:
+  port: 0
+  publicHost: localhost
+  publicPort: 0
+  publicScheme: http
+
+# Configuration for the web test server.
+webServer:
+  port: 0
+  publicHost: localhost
+  publicPort: 0
+  publicScheme: http
+
+# This is the database setup for your test server.
+database:
+  host: localhost
+  port: 9090
+  name: halkyon_meditate_test
+  user: postgres
+  dataPath: .serverpod/test/pgdata
+  #maxConnectionCount: 10 # Defaults to 10, a negative or null value removes the limit
+
+
+# Session logs stay out of the database, for privacy, as Learn's (never re-enable).
+sessionLogs:
+  persistentEnabled: false
+  consoleEnabled: true
+# consoleLogFormat: json # Defaults to "json", options are "text" or "json"
+
+#futureCall:
+#  enabled: true # Defaults to true, set to false to disable scheduling and running future calls
+#  executionEnabled: true # Defaults to true
+#  concurrencyLimit: 1 # Defaults to 1, a negative or null value removes the limit
+#  scanInterval: 5000 # Unit in milliseconds, defaults to 5000