fix(parser): parse memory context from turn_context for Codex v0.135.0

[delexw]

Summary

Codex v0.135.0 (PR #24591) migrated memory runtime state from file-based storage to a dedicated SQLite database. Active memories are now injected into context at the start of each turn and emitted into the JSONL session file via the turn_context event under a memories array field.

This PR adds parsing support for that field so codex-trace correctly exposes memory context in traces produced by v0.135.0+ sessions.

Changes

• src-tauri/src/parser/turn.rs: Added memories: Vec<String> field to CodexTurn. Updated handle_turn_context to extract the memories array from the turn_context JSONL payload. Pre-v0.135.0 sessions with no memories field default to an empty Vec gracefully.
• shared/types.ts: Added memories?: string[] to the CodexTurn TypeScript interface (optional so existing test fixtures remain valid; the Rust backend always serialises it as [] or with values).
• src-tauri/src/parser/entry.rs: Added v0.135.0 regression tests verifying turn_context entries with a memories array parse correctly through RawEntry.
• src-tauri/src/parser/session.rs: Added full-session tests confirming memories appear on turns and that pre-v0.135.0 sessions produce an empty memories Vec without error.
• src-tauri/src/parser/turn.rs (tests): Added three tests covering: memories parsed correctly, pre-v0.135.0 no-memories path, and memories preserved independently per turn across a multi-turn session.

Testing

• 138 Rust lib tests pass (including 7 new tests for this change)
• 128 frontend vitest tests pass (no regressions)
• tsc --noEmit clean
• cargo clippy -- -D warnings clean
• HTTP API smoke test: POST /api/sessions returns 200

Fixes

Fixes #85