Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@refactron/verification/checks/syntax.py`:
- Around line 1-26: The new fast-path must be merged into the existing
SyntaxVerifier without changing the BaseCheck contract: update the existing
SyntaxVerifier.verify method to keep the signature verify(self, original: str,
transformed: str, file_path: Path) -> CheckResult, and implement the
VerificationContext optimization inside that method by retrieving or accepting a
VerificationContext instance from the surrounding engine (use the existing
engine/context helper rather than adding a new optional parameter); if a cached
context indicates transformed_ast is None and transformed.strip() != "" return a
failing CheckResult, otherwise attempt ast.parse(transformed) and return the
appropriate CheckResult on parse failure or success; also wrap/shorten the long
import/type line to <=100 chars and ensure you reference the types
VerificationContext and CheckResult where required.

---

Nitpick comments:
In `@refactron/analysis/symbol_table.py`:
- Line 180: The condition uses getattr(self, "cache_dir", None) even though
cache_dir is always set in __init__; replace the getattr call with a direct
attribute check (use self.cache_dir) in the conditional inside the method where
updated is checked (the if statement currently written as getattr(self,
"cache_dir", None) and updated). Update the condition to use self.cache_dir and
keep the rest of the logic unchanged so it matches the style used elsewhere
(e.g., the direct access on line 142).
- Around line 72-76: The loop declares an unused variable `symbol` in "for name,
symbol in list(names.items())" which triggers a linter warning; change the loop
to only use the name (e.g., "for name in list(names.keys())" or "for name, _ in
list(names.items())") so the unused variable is removed, keeping the existing
logic that checks self.exports[name].file_path == file_path and deletes from
self.exports.
- Around line 149-151: The list comprehension assigning python_files is over 100
chars; split the expression across multiple lines or extract the condition into
a named helper to stay within the limit. For example, move the any(...) check
into a small function or a separate variable (e.g., is_excluded = lambda p:
any(excluded in p.parts for excluded in excluded_dirs)) and then build
python_files = [f for f in all_python_files if not is_excluded(f)] so the line
lengths for python_files, the condition, and the any(...) call are each under
100 characters; references: python_files, all_python_files, excluded_dirs.

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@refactron/analysis/symbol_table.py`:
- Around line 170-172: The metadata advance is happening regardless of whether
_analyze_file succeeded; modify the flow so that symbol_table.metadata[file_str]
= mtime and updated = True are only executed after a successful run of
_analyze_file (i.e., no exception was raised). Concretely, in the blocks that
call _analyze_file (referencing _analyze_file, file_str, mtime,
symbol_table.metadata, and the updated flag), move the metadata assignment and
updated=True into the success path (or after try/except only if no exception
occurred) and ensure caught exceptions do not update metadata so failed analyses
will be retried later; apply the same change for both occurrences that wrap
_analyze_file (the first block and the block around lines 188-199).
- Around line 67-80: The early return in remove_file prevents cleaning up
self.metadata for files that had no extracted symbols; update remove_file (in
symbol_table.SymbolTable) to always delete metadata for file_path even when
file_path not in self.symbols—either remove the early return and wrap the
symbol-specific cleanup in an if block (if file_path in self.symbols: ...del
self.symbols[file_path]) or keep the early return but perform metadata deletion
before returning (if file_path not in self.symbols: if file_path in
self.metadata: del self.metadata[file_path]; return); preserve the existing
export-cleanup logic for files that do exist in self.symbols.
- Around line 64-65: The metadata cache currently types values as Dict[str,
float] and uses st_mtime (float); change the metadata annotation to Dict[str,
int], replace any os.stat(...).st_mtime reads with os.stat(...).st_mtime_ns so
stored mtimes are integer nanoseconds, and update the deserialization path that
loads saved metadata to convert values to ints (e.g., {k: int(v) for k, v in
data.get("metadata", {}).items()}) so comparisons use integer ns timestamps.
Ensure you update the declaration of the metadata field, the place(s) that
set/check file mtime (use st_mtime_ns), and the load/deserialize code that
reconstructs metadata from persisted data.

---

Outside diff comments:
In `@refactron/analysis/symbol_table.py`:
- Around line 67-301: The file has trailing whitespace and needs Black/Flake8
formatting; run the repo pre-commit hooks (or run black and flake8 manually) to
fix whitespace and style issues: remove trailing whitespace and run black with
target-version options for py38, py39, py310, py311, then run flake8 with
max-line-length=100 to apply lint rules; re-run the tests/CI to ensure hooks
pass and commit the reformatted changes (this affects functions like
remove_file, add_symbol, build_for_project, _save_cache, and _load_cache
referenced in the diff).

---

Nitpick comments:
In `@refactron/analysis/symbol_table.py`:
- Around line 183-184: The broad except in build_for_project (the except
Exception as e around the cache save) should be narrowed and include traceback
context: catch only likely I/O/serialization errors (e.g., OSError/IOError and
pickle.PicklingError or the specific serializer error used) instead of
Exception, and log the failure with exc_info=True (or use logger.exception) so
the traceback is preserved; update the import list if you reference
pickle.PicklingError or other specific exception classes and replace the current
logger.warning(...) line with the narrowed except block and structured logging
call.