A series of independent, self-contained fixes — one issue per commit, pushed separately so every commit gets its own complete test.yml run and is easy to review (and cherry-pick) individually.

Commits

1. Close sqlite connections before replacing history database — fixes history clear/trim fails on Windows: PermissionError on history.sqlite (open SQLite handle blocks unlink) #15241.
   sqlite3.Connection used as a context manager only commits/rolls back, it does not close. ipython history trim/clear therefore still had open handles on history.sqlite while unlinking/renaming it, which fails with PermissionError on Windows and leaves history.sqlite.new* debris behind. Both connections are now wrapped in contextlib.closing, and a regression test runs the trim and clear subcommands in a subprocess (exercised on Windows CI). (all workflows green on this SHA)

2. Make test_hist_file_config teardown deterministic — fixes Flaky test - teardown in test_hist_file_config #15161.
   The test created a HistoryManager backed by a real file but never stopped its HistorySavingThread; the thread briefly holds a strong reference to the manager inside its polling loop, so the instance could survive the gc.collect() in the hmmax fixture teardown and trip the instance-leak assertion intermittently (~3/10 Fedora builds). The test now stops the thread and closes the db like the other tests in the file. (all workflows green on this SHA)

3. Use tokenize.open to read source files in deduperreload — closes UnicodeDecodeError in deduperreload on Windows (first %load_ext autoreload) #15193.
   Honor PEP 263 coding cookies when reading module sources for the autoreload diffing logic, the way the import system does. (The original cp1252 UnicodeDecodeError crash in that issue was already fixed by reading with an explicit utf-8 encoding; this handles the remaining non-utf-8 sources, which were silently treated as unpatchable with a noisy logged traceback.) The regression test fails with the previous explicit-utf-8 reading.

4. Deprecate IPython.utils.generics.inspect_object — first step towards deprecated and remove IPython/utils/generics.py #15068.
   inspect_object is not called anywhere in IPython anymore and no public external users were found (unlike complete_object, which pyflyby/riptable/maiev register completers on, and which is unchanged). The DeprecationWarning is emitted through a module __getattr__, so simply importing the name warns — covering consumers that only call .register().

5. Add regression test for SyntaxError subclasses without text — closes AssertionError while rendering traceback in ipython 9.6.0 #15024.
   xml.etree.ElementTree.ParseError leaves .text as None; 9.6.0 raised an AssertionError rendering it. The guard landed with Fix #15011, Exception.text may be None #15012 but had no test; this locks the behavior in (the test fails if the None check in ListTB._format_exception_only is removed).

Notes from triage

• pretty printer ignores inhereted _repr_pretty_ methods #15250 (pretty printer ignores inherited _repr_pretty_) could not be reproduced on current main: the MRO walk in RepresentationPrinter.pretty finds parent-class _repr_pretty_ (also covered by test_callability_checking in tests/test_pretty.py). That issue can probably be closed.
• CWD is not in sys.path when "-P" is used #15214 (-P/safe_path drops CWD from sys.path): analysis done, needs a maintainer decision. sys.flags.safe_path is currently a hard override in InteractiveShellApp.init_path — even an explicit --no-ignore-cwd cannot restore CWD. If the Fedora use case (-P in shebangs meaning "keep the script dir off sys.path") should be supported, the minimal fix is to let an explicitly-set ignore_cwd=False win over safe_path; happy to implement that in a follow-up if desired.
• Underscore variable (_) not restored as last expression result after deletion when first input is a string #15000, ipython turns all non-zero exit codes to 1 when script ran with "ipython -c script.py" uses sys.exit() #15132, _repr_mimebundle_ ignores NotImplementedError #15154, Can IPython print a warning if unable to open ipython_config.py? #14987, oinspect throws TypeError when parsing incomplete code line involving polars.expr.expr #15072 were considered but already have open PRs (Restore underscore tracking after deletion #15243, fix: preserve sys.exit() exit codes in non-interactive mode #15158, fix: only surface nested repr_mimebundle NotImplementedError #15168, Adding check if file not found and cleanups (#14987) #15032, Fix oinspect TypeError with generic __getattr__ objects; fix test path quoting #15237/Fix oinspect TypeError with generic __getattr__ objects; fix test path quoting #15246), so they are deliberately not duplicated here.

https://claude.ai/code/session_01AtmUVnQwZfjDBuUzF7TdGh