Add process_uuid to sqlite logs (#11534)

## Summary
This PR is the first slice of the per-session `/feedback` logging work:
it adds a process-unique identifier to SQLite log rows.

It does **not** change `/feedback` sourcing behavior yet.

## Changes
- Add migration `0009_logs_process_id.sql` to extend `logs` with:
  - `process_uuid TEXT`
  - `idx_logs_process_uuid` index
- Extend state log models:
  - `LogEntry.process_uuid: Option<String>`
  - `LogRow.process_uuid: Option<String>`
- Stamp each log row with a stable per-process UUID in the sqlite log
layer:
  - generated once per process as `pid:<pid>:<uuid>`
- Update sqlite log insert/query paths to persist and read
`process_uuid`:
  - `INSERT INTO logs (..., process_uuid, ...)`
  - `SELECT ..., process_uuid, ... FROM logs`

## Why
App-server runs many sessions in one process. This change provides a
process-scoping primitive we need for follow-up `/feedback` work, so
threadless/process-level logs can be associated with the emitting
process without mixing across processes.

## Non-goals in this PR
- No `/feedback` transport/source changes
- No attachment size changes
- No sqlite retention/trim policy changes

## Testing
- `just fmt`
- CI will run the full checks

codex-rs/state/src/runtime.rs

@@ -360,7 +360,7 @@ FROM threads
         }
 
         let mut builder = QueryBuilder::<Sqlite>::new(
-            "INSERT INTO logs (ts, ts_nanos, level, target, message, thread_id, module_path, file, line) ",
+            "INSERT INTO logs (ts, ts_nanos, level, target, message, thread_id, process_uuid, module_path, file, line) ",
         );
         builder.push_values(entries, |mut row, entry| {
             row.push_bind(entry.ts)
@@ -369,6 +369,7 @@ FROM threads
                 .push_bind(&entry.target)
                 .push_bind(&entry.message)
                 .push_bind(&entry.thread_id)
+                .push_bind(&entry.process_uuid)
                 .push_bind(&entry.module_path)
                 .push_bind(&entry.file)
                 .push_bind(entry.line);
@@ -388,7 +389,7 @@ FROM threads
     /// Query logs with optional filters.
     pub async fn query_logs(&self, query: &LogQuery) -> anyhow::Result<Vec<LogRow>> {
         let mut builder = QueryBuilder::<Sqlite>::new(
-            "SELECT id, ts, ts_nanos, level, target, message, thread_id, file, line FROM logs WHERE 1 = 1",
+            "SELECT id, ts, ts_nanos, level, target, message, thread_id, process_uuid, file, line FROM logs WHERE 1 = 1",
         );
         push_log_filters(&mut builder, query);
         if query.descending {