build: release pylance 9.0.1+exa.13

[dsingh-exa]

Summary

Advance the Python package to 9.0.1+exa.13 (python/Cargo.toml + python/Cargo.lock, nothing else). Same release procedure as #42: build the x86_64/aarch64 manylinux2014 wheels with .github/exa-release/reproduce-wheel.sh (pinned Rust 1.91.0 / Zig 0.16.0 / maturin 1.15.0 / protoc 24.4, two clean builds must hash-match), run test-wheel-s3.py, tag v9.0.1-exa.13 and attach the verified wheels.

Changes since exa.12 on this branch:

• perf(commit): drop O(C^2) field lookups from column index validation (backport #8720) #43 — check_column_indices: precomputed field-id map + one validation per interned (fields, column_indices) list instead of O(fields²) recursive lookups per data file (backport of perf(commit): drop O(C^2) field lookups from column index validation lance-format/lance#8720). Single Append commit on a ~150-field / 6M-fragment manifest: 142s → 49s.
• perf(commit): dedupe fix_schema field-list scans and encode manifest protobuf once #44 — fix_schema scans each distinct field-list pointer set once; write_protobuf encodes the manifest once instead of encoded_len() + encode_to_vec(). Same commit: 49s → 40s.
• perf(dataset): serve read_version_transaction from the held or cached manifest #33 — read_version_transaction served from the held/cached manifest instead of re-downloading the full manifest per version.
• perf(encoding): append zstd output into reserved capacity instead of zero-filling #41 — zstd decompression writes into reserved capacity instead of a zero-filled buffer (accumulator read+concat −10.8%).

Verification on the branch head: full cargo test -p lance (2486 lib + integration/resource/doctests, 0 failures) and cargo test -p lance-encoding (482) passed on #44/#41; a commit/accumulate data-integrity suite (repeated merged Appends with idempotency keys, concurrent commits, merge_columns multi-file fragments, deletes, full read-back equality, cross-read with the exa.12 wheel) is running against a build of this head and its results will be posted here before merge.

Link to Devin session: https://app.devin.ai/sessions/0439f46829054112a585c8b2f3611ad9
Open in Devin Desktop: https://app.devin.ai/desktop/session/0439f46829054112a585c8b2f3611ad9?variant=devin
Requested by: @dsingh-exa

[devin-ai-integration]

I'll fix CI failures and address comments from users with write access. I'll skip comments containing "(aside)".

• Disable automatic comment, CI, and merge conflict monitoring