dvc repro: rolls back .gitignore entries for successful stages when a later stage fails

# Bug Report


## Description

When `dvc repro` runs a pipeline with multiple stages and a later stage fails, `.gitignore` entries added for outputs of earlier successfully completed stages are rolled back.

For comparison, when the same pipeline completes successfully, DVC correctly creates `output/.gitignore` containing:

```gitignore
/out1
/out2
```

If `stage2` is changed to fail after creating its output, the files are still created, `dvc.lock` is updated, but the `.gitignore` entries are not created. After fixing the `stage2` command and rerunning `dvc repro`, the outs of `stage2`  are correctly added to the `.gitignore` but `stage1` .

The way I fix that now is by manually typing the succesfully run outputs into the `.gitignore`, which is cumbersome. Maybe there is a command to do it that I don't know about? But anyway, to me it would make more sense if the 


## Reproduce

Start in an empty Git repository:

```console
$ git init
$ uvx dvc init
```

Create the following `dvc.yaml`:

```yaml
stages:
  stage1:
    outs: [output/out1]
    cmd:
      - mkdir -p output
      - echo ok > output/out1

  stage2:
    deps: [output/out1]
    outs: [output/out2]
    cmd:
      - cp output/out1 output/out2
      - exit 1
```

Run:

```console
$ uvx dvc repro dvc.yaml
```

As expected, `dvc repro` fails because of `exit 1`.

Both output files have nevertheless been created:

```console
$ ls output
out1  out2
```

However, the ignore rules for the outputs are not created in `output/.gitignore`. When running with `-v` it states explicitly that the `.gitignore` entry of  `out1` is removed. I guess this technically means this is not a bug but intended behavior, but it is counterintuitive and counterproductive for normal use.

As a control, removing the following command from `stage2`:

```yaml
- exit 1
```

and running the same pipeline successfully (in a clean repo state) results in:

```gitignore
/out1
/out2
```

being added to `output/.gitignore`.

## Expected

The `.gitignore` entry for `output/out1` should be created. `stage1` completed successfully, its output remains in the workspace, and the `dvc.lock` file is updated succesfully. A failure in the downstream `stage2` should not roll back Git ignore state belonging to the already completed stage.

## Environment information

Output of `dvc doctor`:

```console
$ uvx dvc doctor
DVC version: 3.67.1 (pip)
-------------------------
Platform: Python 3.14.2 on Linux-7.1.5-76070105-generic-x86_64-with-glibc2.39
Subprojects:
        dvc_data = 3.18.3
        dvc_objects = 5.2.0
        dvc_render = 1.0.2
        dvc_task = 0.40.2
        scmrepo = 3.6.2
Supports:
        http (aiohttp = 3.14.3, aiohttp-retry = 2.9.1),
        https (aiohttp = 3.14.3, aiohttp-retry = 2.9.1)
Config:
        Global: /home/joostmeulenbeld/.config/dvc
        System: /etc/xdg/dvc
Cache types: hardlink, symlink
Cache directory: ext4 on /dev/mapper/data_bb3Cv-root
Caches: local
Remotes: None
Workspace directory: ext4 on /dev/mapper/data_bb3Cv-root
Repo: dvc, git
Repo.site_cache_dir: /var/tmp/dvc/repo/3fb681d8dcf172821499f0051802062e
```

**Additional Information (if any):**
<details>
<summary>`dvc repro -v` run</summary>

```
2026-09-01 14:00:09,035 DEBUG: v3.67.1 (pip), CPython 3.14.2 on Linux-7.1.5-76070105-generic-x86_64-with-glibc2.39
2026-09-01 14:00:09,035 DEBUG: command: /home/joostmeulenbeld/.cache/uv/archive-v0/KgpsAQHnaEG055oR/bin/dvc repro -v
2026-09-01 14:00:09,412 DEBUG: Output 'output/out1' of stage: 'stage1' changed because it is 'not in cache'.
2026-09-01 14:00:09,412 DEBUG: stage: 'stage1' changed.
2026-09-01 14:00:09,415 DEBUG: Removing output 'output/out1' of stage: 'stage1'.
2026-09-01 14:00:09,415 DEBUG: Removing '/home/joostmeulenbeld/git/mwe_dvc_noignore/output/out1'
Running stage 'stage1':
> mkdir -p output
> echo ok > output/out1
2026-09-01 14:00:09,428 DEBUG: Added '/home/joostmeulenbeld/git/mwe_dvc_noignore/output/out1' to gitignore file.
2026-09-01 14:00:09,437 DEBUG: Computed stage: 'stage1' md5: 'fc98065f95e8b773dcd45d4d3e4fb0f8'                                                                                                                                                    
2026-09-01 14:00:09,441 DEBUG: Preparing to transfer data from 'memory://dvc-staging-md5/cc0bb25b96409904853d0280d6caaf899e5e170c9701e667d661ed11eed04c8e' to '/home/joostmeulenbeld/git/mwe_dvc_noignore/.dvc/cache/files/md5'                    
2026-09-01 14:00:09,441 DEBUG: Preparing to collect status from '/home/joostmeulenbeld/git/mwe_dvc_noignore/.dvc/cache/files/md5'
2026-09-01 14:00:09,441 DEBUG: Collecting status from '/home/joostmeulenbeld/git/mwe_dvc_noignore/.dvc/cache/files/md5'
2026-09-01 14:00:09,442 DEBUG: Preparing to collect status from 'memory://dvc-staging-md5/cc0bb25b96409904853d0280d6caaf899e5e170c9701e667d661ed11eed04c8e'                                                                                        
2026-09-01 14:00:09,443 DEBUG: link type reflink is not available ([Errno 95] no more link types left to try out)                                                                                                                                  
2026-09-01 14:00:09,443 DEBUG: Removing '/home/joostmeulenbeld/git/mwe_dvc_noignore/output/.svn_L2PF3RMz-pj5F5cSVw.tmp'
2026-09-01 14:00:09,444 DEBUG: Removing '/home/joostmeulenbeld/git/mwe_dvc_noignore/output/.svn_L2PF3RMz-pj5F5cSVw.tmp'
2026-09-01 14:00:09,444 DEBUG: Removing '/home/joostmeulenbeld/git/mwe_dvc_noignore/.dvc/cache/files/md5/.Tsjlf-3HNp_ytWCDNf1QMw.tmp'
2026-09-01 14:00:09,444 DEBUG: Removing '/home/joostmeulenbeld/git/mwe_dvc_noignore/output/out1'                                                                                                                                                   
2026-09-01 14:00:09,467 DEBUG: stage: 'stage1' was reproduced                                                                                                                                                                                      

2026-09-01 14:00:09,475 DEBUG: 'cmd' of stage: 'stage2' has changed.
2026-09-01 14:00:09,475 DEBUG: stage: 'stage2' changed.
2026-09-01 14:00:09,476 DEBUG: 'cmd' of stage: 'stage2' has changed.
2026-09-01 14:00:09,476 DEBUG: stage: 'stage2' changed.
2026-09-01 14:00:09,477 DEBUG: Removing output 'output/out2' of stage: 'stage2'.
2026-09-01 14:00:09,477 DEBUG: Removing '/home/joostmeulenbeld/git/mwe_dvc_noignore/output/out2'
2026-09-01 14:00:09,479 DEBUG: 'cmd' of stage: 'stage2' has changed.                                                                                                                                                                               
Running stage 'stage2':                                                                                                                                                                                                                            
> cp output/out1 output/out2
> exit 1
2026-09-01 14:00:09,501 DEBUG: Removing '/home/joostmeulenbeld/git/mwe_dvc_noignore/output/out1' from gitignore file.
2026-09-01 14:00:09,502 ERROR: failed to reproduce 'stage2': failed to run: exit 1, exited with 1
Traceback (most recent call last):
  File "/home/joostmeulenbeld/.cache/uv/archive-v0/KgpsAQHnaEG055oR/lib/python3.14/site-packages/dvc/repo/reproduce.py", line 187, in _reproduce
    ret = repro_fn(stage, upstream=upstream, force=force_stage, **kwargs)
  File "/home/joostmeulenbeld/.cache/uv/archive-v0/KgpsAQHnaEG055oR/lib/python3.14/site-packages/dvc/repo/reproduce.py", line 117, in _reproduce_stage
    ret = stage.reproduce(**kwargs)
  File "/home/joostmeulenbeld/.cache/uv/archive-v0/KgpsAQHnaEG055oR/lib/python3.14/site-packages/funcy/decorators.py", line 47, in wrapper
    return deco(call, *dargs, **dkwargs)
  File "/home/joostmeulenbeld/.cache/uv/archive-v0/KgpsAQHnaEG055oR/lib/python3.14/site-packages/dvc/stage/decorators.py", line 44, in rwlocked
    return call()
  File "/home/joostmeulenbeld/.cache/uv/archive-v0/KgpsAQHnaEG055oR/lib/python3.14/site-packages/funcy/decorators.py", line 68, in __call__
    return self._func(*self._args, **self._kwargs)
           ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/joostmeulenbeld/.cache/uv/archive-v0/KgpsAQHnaEG055oR/lib/python3.14/site-packages/dvc/stage/__init__.py", line 448, in reproduce
    self.run(**kwargs)
    ~~~~~~~~^^^^^^^^^^
  File "/home/joostmeulenbeld/.cache/uv/archive-v0/KgpsAQHnaEG055oR/lib/python3.14/site-packages/funcy/decorators.py", line 47, in wrapper
    return deco(call, *dargs, **dkwargs)
  File "/home/joostmeulenbeld/.cache/uv/archive-v0/KgpsAQHnaEG055oR/lib/python3.14/site-packages/dvc/stage/decorators.py", line 44, in rwlocked
    return call()
  File "/home/joostmeulenbeld/.cache/uv/archive-v0/KgpsAQHnaEG055oR/lib/python3.14/site-packages/funcy/decorators.py", line 68, in __call__
    return self._func(*self._args, **self._kwargs)
           ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/joostmeulenbeld/.cache/uv/archive-v0/KgpsAQHnaEG055oR/lib/python3.14/site-packages/dvc/stage/__init__.py", line 601, in run
    self._run_stage(dry, force, **kwargs)
    ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^
  File "/home/joostmeulenbeld/.cache/uv/archive-v0/KgpsAQHnaEG055oR/lib/python3.14/site-packages/funcy/decorators.py", line 47, in wrapper
    return deco(call, *dargs, **dkwargs)
  File "/home/joostmeulenbeld/.cache/uv/archive-v0/KgpsAQHnaEG055oR/lib/python3.14/site-packages/dvc/stage/decorators.py", line 44, in rwlocked
    return call()
  File "/home/joostmeulenbeld/.cache/uv/archive-v0/KgpsAQHnaEG055oR/lib/python3.14/site-packages/funcy/decorators.py", line 68, in __call__
    return self._func(*self._args, **self._kwargs)
           ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/joostmeulenbeld/.cache/uv/archive-v0/KgpsAQHnaEG055oR/lib/python3.14/site-packages/dvc/stage/__init__.py", line 628, in _run_stage
    return run_stage(self, dry, force, **kwargs)
  File "/home/joostmeulenbeld/.cache/uv/archive-v0/KgpsAQHnaEG055oR/lib/python3.14/site-packages/dvc/stage/run.py", line 182, in run_stage
    run(stage, dry=dry, run_env=run_env)
    ~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/joostmeulenbeld/.cache/uv/archive-v0/KgpsAQHnaEG055oR/lib/python3.14/site-packages/dvc/stage/decorators.py", line 53, in wrapper
    ret = f(stage, *args, **kwargs)
  File "/home/joostmeulenbeld/.cache/uv/archive-v0/KgpsAQHnaEG055oR/lib/python3.14/site-packages/dvc/stage/run.py", line 153, in cmd_run
    _run(executable, cmd, **kwargs)
    ~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/joostmeulenbeld/.cache/uv/archive-v0/KgpsAQHnaEG055oR/lib/python3.14/site-packages/dvc/stage/run.py", line 133, in _run
    raise StageCmdFailedError(cmd, p.returncode)
dvc.stage.exceptions.StageCmdFailedError: failed to run: exit 1, exited with 1

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/home/joostmeulenbeld/.cache/uv/archive-v0/KgpsAQHnaEG055oR/lib/python3.14/site-packages/dvc/cli/__init__.py", line 212, in main
    ret = cmd.do_run()
  File "/home/joostmeulenbeld/.cache/uv/archive-v0/KgpsAQHnaEG055oR/lib/python3.14/site-packages/dvc/cli/command.py", line 30, in do_run
    return self.run()
           ~~~~~~~~^^
  File "/home/joostmeulenbeld/.cache/uv/archive-v0/KgpsAQHnaEG055oR/lib/python3.14/site-packages/dvc/commands/repro.py", line 11, in run
    stages = self.repo.reproduce(**self._common_kwargs, **self._repro_kwargs)
  File "/home/joostmeulenbeld/.cache/uv/archive-v0/KgpsAQHnaEG055oR/lib/python3.14/site-packages/dvc/repo/__init__.py", line 59, in wrapper
    return f(repo, *args, **kwargs)
  File "/home/joostmeulenbeld/.cache/uv/archive-v0/KgpsAQHnaEG055oR/lib/python3.14/site-packages/dvc/repo/scm_context.py", line 150, in run
    return method(repo, *args, **kw)
  File "/home/joostmeulenbeld/.cache/uv/archive-v0/KgpsAQHnaEG055oR/lib/python3.14/site-packages/dvc/repo/reproduce.py", line 248, in reproduce
    return _reproduce(steps, graph=graph, on_error=on_error or "fail", **kwargs)
  File "/home/joostmeulenbeld/.cache/uv/archive-v0/KgpsAQHnaEG055oR/lib/python3.14/site-packages/dvc/repo/reproduce.py", line 191, in _reproduce
    _raise_error(exc, stage)
    ~~~~~~~~~~~~^^^^^^^^^^^^
  File "/home/joostmeulenbeld/.cache/uv/archive-v0/KgpsAQHnaEG055oR/lib/python3.14/site-packages/dvc/repo/reproduce.py", line 155, in _raise_error
    raise ReproductionError(f"failed to reproduce{segment} {names}") from exc
dvc.exceptions.ReproductionError: failed to reproduce 'stage2'

2026-09-01 14:00:09,506 DEBUG: Analytics is enabled.
2026-09-01 14:00:09,547 DEBUG: Trying to spawn ['daemon', 'analytics', '/tmp/tmpjk5e55cl', '-v']
2026-09-01 14:00:09,555 DEBUG: Spawned ['daemon', 'analytics', '/tmp/tmpjk5e55cl', '-v'] with pid 112440
```

</details>

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dvc repro: rolls back .gitignore entries for successful stages when a later stage fails #11091

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dvc repro: rolls back .gitignore entries for successful stages when a later stage fails #11091

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