C: block-scope static record arrays in sqlite VFS init

• Type: bug (C frontend / storage + initializer lowering) — Track C
• Status: DONE (2026-06-28)
• Owner: Track C+A
• Found / Opened: 2026-06-28, while debugging the self-compiled sqlite amalgamation after sqlite3_open(":memory:") reached SQLite initialization.

Symptom

SQLite's Unix VFS initializer declares a block-scope static record array:

static sqlite3_vfs aVfs[] = {
  UNIXVFS("unix", posixIoFinder),
  ...
};

The frontend effectively dropped static, allocated the array as normal stack storage, inferred the unsized record array as one element, and skipped the record-field initializers. sqlite3_os_init() could return success while vfsList was null or pointed at invalid/zeroed storage, and sqlite3MemdbInit() then failed or crashed.

Resolution

• Block-scope static declarations now parse as declarations and allocate their storage globally while still appearing in statement position.
• Local record-array brace initializers now infer the top-level element count and emit per-field assignments for scalar/pointer fields.
• SQLite's sqlite3_os_init() now registers a persistent unix VFS, and sqlite3_open(":memory:") + sqlite3_close succeeds.

Regression: test/clocal_static_record_array_b115.c.