De-generic executor and refactor ORM stack

[KKould]

Summary

This branch reduces compile-time pressure in the execution layer by de-genericizing executor nodes. The executor no longer carries the transaction/storage type parameter through every node; instead, shared execution state is routed through a runtime trait, so executor node code can be compiled once instead of being monomorphized per storage backend.

Key changes:

• Remove the transaction generic from executor nodes and move table, view, index, statistics metadata, cursor, tuple-buffer, and DDL-apply access behind the execution runtime.
• Normalize catalog and planner metadata arenas, including reusable table/column metadata slots and plan arena materialization for execution state.
• Replace bincode/serde-based tuple/catalog serialization paths with project-local serdes implementations and table codec buffer reuse.
• Rework parser, binder, and ORM integration so parser APIs are isolated, binder entry points consume owned statements, and ORM queries bind through normal binder-generated plans.
• Reduce optional runtime dependencies by feature-gating parser, macros, rocksdb, copy, decimal, time, pyo3/wasm-related paths, and trimming shell/server dependency footprint.
• Add execution and optimizer cleanups around static evaluator dispatch, column pruning bookkeeping, parameterized index probes, DESCRIBE column refs, set membership/subquery handling, and allocation reduction.
• Update ORM/macros examples, README/docs, sqllogictest coverage, unit tests, and wasm examples for the new runtime and binding paths.

Binary Size Comparison

Measured as stripped release binaries on x86_64-unknown-linux-gnu with rustc 1.88.0. The KiteSQL binary is a small ORM/typed API smoke example that creates a table, inserts two rows, fetches them, and drops the table.

Important: the PR measurements intentionally do not enable the parser feature. main still has parser/sqlparser as a non-optional dependency, so main cannot be measured with the same no-parser feature set.

Target	Kind	Features / scope	Size
KiteSQL main c0e63a0 memory	embedded database	orm,macros; parser not feature-gated on main	7.25 MiB
KiteSQL PR 4ee5c66 memory	embedded database	orm; parser disabled	2.25 MiB
KiteSQL main c0e63a0 RocksDB	embedded database	orm,macros,rocksdb; parser not feature-gated on main	15.74 MiB
KiteSQL PR 4ee5c66 RocksDB	embedded database	orm,rocksdb; parser disabled	10.08 MiB
KiteSQL main c0e63a0 LMDB	embedded database	orm,macros,lmdb; parser not feature-gated on main	8.27 MiB
KiteSQL PR 4ee5c66 LMDB	embedded database	orm,lmdb; parser disabled	2.60 MiB
rusqlite 0.34.0 + bundled SQLite	SQLite binding / embedded SQLite	minimal in-memory SQL smoke app	1.31 MiB
SeaORM 2.0.0-rc.38	ORM framework, not a database	minimal SQLite query-builder/model app, no DB engine linked	0.39 MiB
Diesel 2.3.10 + bundled SQLite	ORM/query builder, not a database	minimal SQLite ORM app with bundled libsqlite3	1.36 MiB
Turso	embedded database	0.7.0-pre.7 and pinned 0.5.0 did not compile on this rustc due transitive/proc-macro API requirements	n/a

KiteSQL PR reduction vs main in this measurement:

• memory: 7.25 MiB -> 2.25 MiB, down 68.9%
• RocksDB: 15.74 MiB -> 10.08 MiB, down 36.0%
• LMDB: 8.27 MiB -> 2.60 MiB, down 68.5%

TPCC Throughput Comparison

Measured on the current PR branch at 192c5c9 with ./scripts/run_tpcc_matrix.sh after removing old TPCC database state. The runner uses 1 warehouse, TPCC default 720s measurement windows, and removes each backend database path before running the variant. Raw logs were generated locally during the run and are not committed. Note: this is a single local long-window run; follow-up same-machine 120s checks did not reproduce a large regression at 65a57bf, so these TPCC numbers should be treated as preliminary until rerun under a controlled benchmark state.

Backend	Profile	TpmC	Measure Time	Status
KiteSQL LMDB	embedded database / LMDB	56877	720s	ok
KiteSQL RocksDB	embedded database / RocksDB	27697	720s	ok
SQLite	balanced profile	39815	720s	ok
SQLite	practical profile	42407	720s	ok

Testing

• cargo test --workspace
• make wasm-build && make wasm-examples
• Size smoke builds for KiteSQL memory/RocksDB/LMDB with parser disabled on this PR branch