docs: fix cross-links after the refresh; remove the stale benchmark script

- docs/README.md links the improvement logs and June plans where the
  refresh archived them (docs/archive/).
- clawhdf5-py README: 'r+' creates and replaces attributes (compact or
  dense); only deleting them is unsupported.
- scripts/run-benchmarks.sh benchmarked the pre-rename rustyhdf5-format
  and overwrote BENCHMARKS.md; nothing referenced it. Removed.
- Cargo.toml descriptions no longer name rustyhdf5/edgehdf5; clawhdf5-gpu
  says it is not HDF5 I/O.
- benchmarks/cross_platform.sh pointed at a ROADMAP section that no longer
  exists.

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>

scripts/run-benchmarks.sh

@@ -1,77 +0,0 @@
-#!/usr/bin/env bash
-# Run Criterion benchmarks for rustyhdf5-format and generate a markdown report.
-#
-# Usage:
-#   ./scripts/run-benchmarks.sh
-#
-# Output:
-#   BENCHMARKS.md in the repository root
-
-set -uo pipefail
-
-REPO_ROOT="$(cd "$(dirname "$0")/.." && pwd)"
-REPORT="$REPO_ROOT/BENCHMARKS.md"
-BENCH_OUTPUT=$(mktemp)
-
-echo "==> Running benchmarks for rustyhdf5-format ..."
-cargo bench -p rustyhdf5-format 2>&1 | tee "$BENCH_OUTPUT"
-BENCH_EXIT=${PIPESTATUS[0]}
-
-if [ "$BENCH_EXIT" -ne 0 ]; then
-    echo "ERROR: cargo bench failed with exit code $BENCH_EXIT"
-    rm -f "$BENCH_OUTPUT"
-    exit 1
-fi
-
-# Parse criterion output lines like:
-#   bench_name          time:   [1.234 ms 1.256 ms 1.278 ms]
-# We extract the middle (point estimate) value.
-declare -a NAMES=()
-declare -a TIMES=()
-
-while IFS= read -r line; do
-    if [[ "$line" =~ ^([a-zA-Z0-9_/]+)[[:space:]]+time:[[:space:]]+\[.*[[:space:]]+([-0-9.]+[[:space:]]+(ns|µs|us|μs|ms|s))[[:space:]]+.*\] ]]; then
-        NAMES+=("${BASH_REMATCH[1]}")
-        TIMES+=("${BASH_REMATCH[2]}")
-    fi
-done < "$BENCH_OUTPUT"
-
-# Generate report
-{
-    echo "# rustyhdf5-format Benchmark Results"
-    echo ""
-    echo "Generated: $(date -u '+%Y-%m-%d %H:%M:%S UTC')"
-    echo ""
-    echo "## System Info"
-    echo ""
-    echo "- **OS**: $(uname -srm)"
-    echo "- **Rust**: $(rustc --version)"
-    echo "- **CPU**: $(sysctl -n machdep.cpu.brand_string 2>/dev/null || lscpu 2>/dev/null | grep 'Model name' | sed 's/.*: *//' || echo 'unknown')"
-    echo ""
-    echo "## Results"
-    echo ""
-    echo "| Benchmark | Time (point estimate) |"
-    echo "|-----------|----------------------|"
-
-    for i in "${!NAMES[@]}"; do
-        echo "| ${NAMES[$i]} | ${TIMES[$i]} |"
-    done
-
-    if [ "${#NAMES[@]}" -eq 0 ]; then
-        echo "| (no results parsed — see raw output below) | — |"
-    fi
-
-    echo ""
-    echo "## Notes"
-    echo ""
-    echo "- All benchmarks use Criterion.rs with default settings."
-    echo "- 1M dataset = 1,000,000 f64 values (~7.6 MB)."
-    echo "- Chunked benchmarks use 10K-element chunks."
-    echo "- Run with: \`./scripts/run-benchmarks.sh\`"
-} > "$REPORT"
-
-rm -f "$BENCH_OUTPUT"
-
-echo ""
-echo "==> Benchmark report written to $REPORT"
-echo "==> $(( ${#NAMES[@]} )) benchmarks captured."