chore: add opt-in large-tier benchmarks

[FBumann]

Adds a large tier to the benchmark suite: production-sized cases that guard the memory-amplification regime the PR-sized cases can't reach, opt-in via a --large pytest flag (skipped by default, in CI too — they run locally before dependency bumps or performance work, per benchmarks/README.md).

Two cases, measured locally on tsam 3.4.2:

• test_large_wide — 730 days × 256 columns (~34 MB input, full production config): 2.6 s, 415 MiB peak (the ~12× memory amplification is exactly what this guards)
• test_large_scenarios — 365 days × 64 columns × 8 scenarios: 3.6 s, 106 MiB peak

Gating is a benchmarks/conftest.py --large option + large marker; without the flag the cases collect as skipped, so the CI workflow needs no change.

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between 3fccdfc and ea7ddcf.

📒 Files selected for processing (3)

• benchmarks/README.md
• benchmarks/conftest.py
• benchmarks/test_bench_aggregate.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/large-benchmarks

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[github-actions]

Benchmarks

Δ% vs base, one table sorted by biggest change first
(min walltime and memray peak). Peak memory is
deterministic — any delta there is real; walltime on GitHub
runners is noisy, so only large time deltas are meaningful.
The interactive plot is attached as the benchmark-plot artifact.

Full table

benchmarks/test_bench_aggregate.py

name	metric	base	head
test_e2e_wide[medoid]	time	0.5384s	+4.3%
	peak	113 MiB	0.0%
test_user_apply	time	0.4398s	+3.3%
	peak	104 MiB	0.0%
test_config_extremes[append]	time	0.056s	+3.2%
	peak	1.9 MiB	0.0%
test_wrapper_to_dataframe	time	0.0004241s	+1.8%
	peak	8.55 MiB	0.0%
test_e2e_slices	time	1.304s	+1.7%
	peak	14.3 MiB	0.0%
test_config_representation[medoid]	time	0.05443s	+1.6%
	peak	1.9 MiB	0.0%
test_config_representation[dist_global]	time	0.1398s	+1.5%
	peak	1.78 MiB	0.0%
test_user_disaggregate	time	0.01305s	+1.4%
	peak	26.7 MiB	0.0%
test_e2e_wide[dist_global]	time	2.02s	+1.4%
	peak	104 MiB	0.0%
test_config_extremes[replace]	time	0.05611s	+1.3%
	peak	1.9 MiB	0.0%
test_config_representation[dist_cluster]	time	0.05323s	+1.3%
	peak	1.78 MiB	0.0%
test_config_representation[mean]	time	0.05183s	+1.1%
	peak	1.78 MiB	0.0%
test_e2e_full	time	0.1618s	+1.0%
	peak	6.6 MiB	0.0%
test_config_representation[dist_global_minmax]	time	0.1427s	+1.0%
	peak	1.78 MiB	0.0%
test_e2e_default	time	0.07013s	+0.5%
	peak	7.11 MiB	0.0%
test_wrapper_concat_results	time	0.02197s	+0.1%
	peak	8.72 MiB	0.0%
test_e2e_multidim	time	0.2447s	-4.6%
	peak	26.7 MiB	0.0%
test_wrapper_result_conversion	time	0.04036s	-9.7%
	peak	60.3 MiB	0.0%