Fix staticcheck U1000 warnings for deprecated functions

Added `//lint:ignore U1000` directives to deprecated functions:
- extractPartitionData()
- extractRowsWithProgress()

These functions are intentionally kept for potential rollback to the
non-streaming architecture if needed. The staticcheck directive
suppresses the "unused code" warning (U1000).

Note: Local staticcheck may fail on Go 1.24.10 (dev version), but CI
uses stable Go 1.21-1.23 where this will work correctly.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: kevinelliott

cmd/archiver.go

@@ -1386,6 +1386,7 @@ func (a *Archiver) checkCachedMetadata(partition PartitionInfo, objectKey string
 // Deprecated: Replaced by extractPartitionDataStreaming. Kept for potential rollback.
 //
 //nolint:unused // Kept for rollback capability
+//lint:ignore U1000 Kept for potential rollback to non-streaming architecture
 func (a *Archiver) extractPartitionData(partition PartitionInfo, program *tea.Program, cache *PartitionCache, updateTaskStage func(string)) ([]byte, int64, error) {
 	extractStart := time.Now()
 	updateTaskStage("Extracting data...")
@@ -1683,6 +1684,7 @@ func (a *Archiver) printSummary(results []ProcessResult) {
 // Deprecated: Replaced by extractPartitionDataStreaming. Kept for potential rollback.
 //
 //nolint:gocognit,unused // complex row extraction with progress tracking, kept for rollback capability
+//lint:ignore U1000 Kept for potential rollback to non-streaming architecture
 func (a *Archiver) extractRowsWithProgress(partition PartitionInfo, program *tea.Program) ([]map[string]interface{}, error) {
 	quotedTable := pq.QuoteIdentifier(partition.TableName)
 	query := fmt.Sprintf("SELECT row_to_json(t) FROM %s t", quotedTable)