feat(pi): prefix Pi Durable's tables in actor sqlite

[eersnington]

Pi Durable's tables (conversations, entries, tasks, submissions, documents, ...) had no prefix and shared the Actor's SQLite with the app's own tables. An app could not create a tasks or documents table of its own.

conversations        →  pi_conversations
entries              →  pi_entries
tasks                →  pi_tasks
submissions          →  pi_submissions
documents            →  pi_documents
document_revisions   →  pi_document_revisions
record_ids           →  pi_record_ids
durable_metadata     →  pi_durable_metadata
durable_schema       →  pi_durable_schema

New SQL (actor-sqlite.ts). All of Pi's SQL passes through actorSqliteExecutor, which now rewrites Pi's table names:

export const PI_DURABLE_TABLES = [
	"durable_schema",
	...tables named by CREATE TABLE in Pi's SQLITE_MIGRATIONS,
];
// exec, run, get, and all send prefixTables(sql): \bconversations\b → pi_conversations

• The names come from Pi's exported SQLITE_MIGRATIONS, so a table that a later Pi version adds gets the prefix too.
• In Pi 1.0.4 and 1.1.0, these names appear in Pi's SQL only as table names.

Stored agents (storage.ts). Migration 4 renames the tables of agents from 0.5.1 and earlier, inside RivetKit's migration savepoint:

for (const table of PI_DURABLE_TABLES)
	if (table exists) ALTER TABLE ${table} RENAME TO pi_${table}

Rollback. RivetKit's migrations() refuses a stored version newer than the code:

0.5.1 agent ──wakes on 0.5.2──▶ migrations 3 and 4 run; conversations and files are kept
0.5.2 agent ──wakes on 0.5.1──▶ does not start: "migration version 4 ... is newer than supported version 2"
                                 the data is kept; it starts again on 0.5.2

So 0.5.1 never opens the renamed tables and creates new, empty Pi tables. The client sees guard.actor_wake_retries_exceeded; the server log names the migration.

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This is part 8 of 9 in a stack:

•  9  docs(agents): type the React example's root id as ConversationId #346
•  8  feat(pi): prefix Pi Durable's tables in actor sqlite #345 👈
•  7  chore(pi): bump and test Pi Durable 1.1.0 #344
•  6  refactor(pi): type action ids with Pi's branded id types #343
•  5  refactor(sandbox-adapter): simplify sandboxEnv #342
•  4  refactor(pi): move databaseEnv into pi and version pi_file #341
•  3  fix(sandbox-adapter): stop waiting on aborted Daytona exec #340
•  2  fix(sandbox-adapter): stop Pi env calls when the run aborts #339
•  1  fix(pi): read an app credential with one source call #338