[#179]: Add v0.144.0 regression guards for paste-corrupted session entries

[delexw]

Fixes #179

Summary

Codex v0.144.0 (upstream PR #31494) fixed a TUI-level bug where pasting terminal control sequences into the Codex prompt window corrupted resumed conversation history written to JSONL session files. This PR adds regression tests confirming that codex-trace's parser already handles both corruption forms gracefully.

Root cause (upstream)

When a user pasted text containing ANSI escape sequences into the Codex TUI before v0.144.0, the sequences were written into the JSONL session file in one of two forms:

• Invalid JSON — raw ESC bytes (0x1b) embedded mid-value break the JSON structure, making the line unparseable.
• Valid JSON, garbled content — the ESC character JSON-encoded as � inside a string value. The line is technically valid JSON but the content is garbled display text.

Parser behaviour (already correct)

RawEntry::parse() in entry.rs is the entry point for every JSONL line:

let v: Value = serde_json::from_str(line).ok()?;

• Case 1 (invalid JSON): serde_json::from_str returns Err, .ok()? short-circuits to None, and filter_map in session.rs silently drops the line. No panic.
• Case 2 (valid JSON, garbled string): The line parses normally. The garbled content is stored as-is in the payload field; downstream code never inspects the raw string bytes. No panic.

No functional code change is needed — the parser already handles both cases.

Changes

Added four tests that document and lock in the existing behaviour:

File	Test	What it verifies
entry.rs	v0144_paste_corrupted_invalid_json_line_is_silently_skipped	Raw ESC bytes → parse() returns None
entry.rs	v0144_response_item_with_unicode_escaped_control_sequences_does_not_panic	�-encoded sequences → parses correctly, no panic
entry.rs	v0144_all_standard_entry_types_parse_correctly	All four v0.144.0 entry types round-trip
turn.rs	v0144_paste_corrupted_resumed_history_response_item_does_not_crash_turn_building	Garbled history entry → turn building completes, status Complete

Verification

cargo test --lib   ->  325 passed; 0 failed
cargo clippy -D warnings  ->  clean
npm test  ->  exit 0