[theoheimel]

Stacked on #301. Removes pyamplicol files that MadGraph7 doesn't need: 259 files, ~230k lines.

Removed

• src/pyamplicol/_profiling_campaign/: the LaTeX report template and stored measurement results that pyamplicol profiling-campaign copy copied into a new campaign directory. The CLI subcommand and the wheel staging step (_stage_packaged_profiling_campaign, which also bundled tools/performance_report and the legacy oracle as pyamplicol/_performance_report) are removed with it.
• tools/performance_report/, tools/fft_profiling/, run_fft_profiling_render.sh, docs/performance_reports/, plus the profiling-campaign and FullColor FFT profiling doc pages.
• 47 tools/developer/ scripts. They are either one-off gates and benchmarks that nothing referenced, or they import tools.performance_report, or they post-process the removed FFT study. The justfile recipes numerical-acceptance, fft-numerical-acceptance and fft-performance-acceptance go with them. These were opt-in and not part of CI.
• umami_example/ and flake.nix/flake.lock. The UMAMI doc page now links to the upstream example instead.
• The tests for all of the above, and the orphaned tests/fixtures/numerical_acceptance/.

Kept

• justfile, because CI runs just typing, just rust-check and just rust-test.
• The reference-fixture tooling (legacy_oracle, reference_capture, reference_fixture, legacy_amplicol.py, analytic_oracles.py), prepare_source_runtime.py, and the remaining benchmark helpers.
• .github/scripts/import_pyamplicol.sh is unchanged. Adding these paths to its filter would rewrite every imported commit SHA, and upstream is archived.

Other edits

• The build backend no longer has the "generated report outputs only" exception in _clean_source_revision. That exception depended on tools/performance_report/source_identity.py.
• .gitattributes: dropped the export-ignore and linguist entries for the deleted paths. Also dropped the -export-ignore exceptions for the legacy oracle, since the wheel no longer bundles it.
• docs/source/conf.py: dropped the performance_reports copy filter.
• Docs: links to the removed pages are gone. The published report PDFs are still linked from upstream.

Testing

• Unit tests for the build backend, CLI utilities, deployment harness, packaging hygiene, sdist manifest, examples, dependency installer, release and benchmarking: 710 passed, 9 skipped (just not installed).
• pytest --collect-only tests collects 4435 tests with only the three known _rusticol errors, which also occur without this change.
• Every remaining tools/**/*.py module imports.
• Not run: a full wheel build, or the native/integration suites.