DoltLite 0.50.6

Staging, reset, and merge correctness fixes.

Version-control correctness

• dolt_at now supports WORKING and STAGED.
• Fixed mixed-schema staging, per-table reset, duplicate dolt_add arguments, and untracked index handling.
• Commits now reject missing foreign-key parent tables.
• Eliminated false dolt_schemas changes for untouched views and triggers.
• FTS merges now rebuild derived indexes when necessary, preventing malformed indexes.

Reliability

• Expanded stateful fuzzing to cover views and triggers.
• Hardened initial-push testing.

Benchmark / int-keys (100K rows, Linux x64)

File-Backed

Reads

Test	SQLite (us)	DoltLite (us)	Multiplier
oltp_point_select	91,489	48,162	0.53
oltp_range_select	17,272	14,096	0.82
oltp_sum_range	16,683	13,296	0.80
oltp_order_range	3,399	3,164	0.93
oltp_distinct_range	4,465	4,342	0.97
oltp_index_scan	10,816	7,547	0.70
select_random_points	16,711	13,246	0.79
select_random_ranges	9,719	5,899	0.61
covering_index_scan	11,045	6,385	0.58
groupby_scan	31,810	33,096	1.04
index_join	9,695	9,606	0.99
index_join_scan	4,177	4,681	1.12
types_table_scan	1,056,907	1,130,864	1.07
table_scan	1,209,271	1,279,247	1.06
oltp_read_only	201,221	149,010	0.74
Average			0.85

Writes

Test	SQLite (us)	DoltLite (us)	Multiplier
oltp_bulk_insert	193,724	259,485	1.34
oltp_insert	21,891	31,142	1.42
oltp_update_index	75,425	105,133	1.39
oltp_update_non_index	58,008	71,717	1.24
oltp_delete_insert	66,446	82,817	1.25
oltp_write_only	42,893	54,776	1.28
types_delete_insert	38,210	42,870	1.12
oltp_read_write	90,719	121,509	1.34
Average			1.30

100000 rows, median of 5 paired invocations per test; autocommit writes use 9, workload-only timing via host monotonic clock when available.