Add comprehensive ANN benchmarking suite

Extend benchmarks-ann/ with results database (SQLite with per-query detail
and continuous writes), dataset subfolder organization, --subset-size and
--warmup options. Supports systematic comparison across flat, rescore, IVF,
and DiskANN index types.

benchmarks-ann/datasets/nyt-384/Makefile

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+MODEL ?= mixedbread-ai/mxbai-embed-xsmall-v1
+K ?= 100
+BATCH_SIZE ?= 512
+DATA_DIR ?= ../nyt/data
+
+all: base.db
+
+$(DATA_DIR):
+	$(MAKE) -C ../nyt data
+
+contents.db: $(DATA_DIR)
+	uv run ../nyt-768/build-contents.py --data-dir $(DATA_DIR) -o $@
+
+base.db: contents.db queries.txt
+	uv run ../nyt-1024/build-base.py \
+		--contents-db contents.db \
+		--model $(MODEL) \
+		--queries-file queries.txt \
+		--batch-size $(BATCH_SIZE) \
+		--k $(K) \
+		-o $@
+
+queries.txt:
+	cp ../nyt/queries.txt $@
+
+clean:
+	rm -f base.db contents.db
+
+.PHONY: all clean

benchmarks-ann/datasets/nyt-384/queries.txt

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+latest news on climate change policy
+presidential election results and analysis
+stock market crash causes
+coronavirus vaccine development updates
+artificial intelligence breakthrough in healthcare
+supreme court ruling on abortion rights
+tech companies layoff announcements
+earthquake damages in California
+cybersecurity breach at major corporation
+space exploration mission to Mars
+immigration reform legislation debate
+renewable energy investment trends
+healthcare costs rising across America
+protests against police brutality
+wildfires destroy homes in the West
+Olympic games highlights and records
+celebrity scandal rocks Hollywood
+breakthrough cancer treatment discovered
+housing market bubble concerns
+federal reserve interest rate decision
+school shooting tragedy response
+diplomatic tensions between superpowers
+drone strike kills terrorist leader
+social media platform faces regulation
+archaeological discovery reveals ancient civilization
+unemployment rate hits record low
+autonomous vehicles testing expansion
+streaming service launches original content
+opioid crisis intervention programs
+trade war tariffs impact economy
+infrastructure bill passes Congress
+data privacy concerns grow
+minimum wage increase proposal
+college admissions scandal exposed
+NFL player protest during anthem
+cryptocurrency regulation debate
+pandemic lockdown restrictions eased
+mass shooting gun control debate
+tax reform legislation impact
+ransomware attack cripples pipeline
+climate activists stage demonstration
+sports team wins championship
+banking system collapse fears
+pharmaceutical company fraud charges
+genetic engineering ethical concerns
+border wall funding controversy
+impeachment proceedings begin
+nuclear weapons treaty violation
+artificial meat alternative launch
+student loan debt forgiveness
+venture capital funding decline
+facial recognition ban proposed
+election interference investigation
+pandemic preparedness failures
+police reform measures announced
+wildfire prevention strategies
+ocean pollution crisis worsens
+manufacturing jobs returning
+pension fund shortfall concerns
+antitrust investigation launched
+voting rights protection act
+mental health awareness campaign
+homeless population increasing
+space debris collision risk
+drug cartel violence escalates
+renewable energy jobs growth
+infrastructure deterioration report
+vaccine mandate legal challenge
+cryptocurrency market volatility
+autonomous drone delivery service
+deep fake technology dangers
+Arctic ice melting accelerates
+income inequality gap widens
+election fraud claims disputed
+corporate merger blocked
+medical breakthrough extends life
+transportation strike disrupts city
+racial justice protests spread
+carbon emissions reduction goals
+financial crisis warning signs
+cyberbullying prevention efforts
+asteroid near miss with Earth
+gene therapy approval granted
+labor union organizing drive
+surveillance technology expansion
+education funding cuts proposed
+disaster relief efforts underway
+housing affordability crisis
+clean water access shortage
+artificial intelligence job displacement
+trade agreement negotiations
+prison reform initiative launched
+species extinction accelerates
+political corruption scandal
+terrorism threat level raised
+food safety contamination outbreak
+ai model release
+affordability interest rates
+peanut allergies in newbons
+breaking bad walter white