git:20260814.c58d54c to git:20260903.8971462

2 added, 0 removed. Audit A to A.

# Rules:

- After writing any Python file, run `uv run tools/syntax_check.py <python_file> [<python_file> ...]` to verify python syntax.

- After write any code, write tests to cover.

- Fix all errors reported by the syntax checker before proceeding.

- use `uv run tools/git_diff.py <file> [<file> ...]` to check file diff.

- use `uv sync --extra=all` after update any `pyproject.toml` to verify the changes.

- The compaction pipeline (`kimi_cli/soul/compaction.py`) includes the durable transaction ledger (`compaction_ledger.py`), balanced tool-pairing cuts (`tool_pairing.py`), and the context-overflow force-compact-and-retry loop (`context_overflow.py`). When changing compaction behavior, keep the ledger failure-isolated (it must never break compaction) and preserve balanced-cut boundaries (never split an assistant tool call from its result).

- **Performance rule**: Always use the following third-party libraries instead of their builtin counterparts. These are already declared as dependencies:

| Third-party | Replaces | Usage |

|---|---|---|

| `orjson` | `json` | `import orjson; orjson.dumps(obj)` / `orjson.loads(data)` — 3-5x faster JSON |

| `msgspec` | `json`, `pickle`, `struct` | `import msgspec; enc = msgspec.json.Encoder(); enc.encode(obj)` / `msgspec.json.decode(data)` — schema-aware fast serialization |

| `uvloop` | asyncio default loop | `import uvloop; uvloop.install()` (Linux/macOS only) — faster async I/O |

| `apsw` | `sqlite3` | `import apsw; conn = apsw.Connection("db.sqlite")` — faster, more complete SQLite wrapper |

| `regex` | `re` | `import regex as re` — drop-in replacement with better performance and features |

| `rapidfuzz` | `difflib` | `from rapidfuzz import fuzz, process` — orders of magnitude faster fuzzy matching |

| `xxhash` | `hashlib` (non-crypto) | `import xxhash; h = xxhash.xxh64(data).hexdigest()` — 10x+ faster hashing |

| `pybase64` | `base64` | `import pybase64; pybase64.b64encode(data)` / `pybase64.b64decode(data)` — faster SIMD-accelerated base64 |

| `pendulum` | `datetime` | `import pendulum; now = pendulum.now()` — drop-in `datetime` replacement with better timezone handling |

+ - Never redirect to `nul` (`> nul`, `2> nul`, `&> nul`, `>> nul`, ...) on Windows: in Git Bash and PowerShell `nul` is an ordinary filename, so those redirections silently create an empty file named `nul`. Use `/dev/null` in Bash and `$null` / `Out-Null` in PowerShell. If an accidental `nul`/`NUL` file already exists in the workspace, delete it.