refactor(cli): split data.go into per-concern ingest files (mechanical)

[LukasWodka]

Summary

Mechanical split of the 1539-line internal/cli/data.go into per-concern files — pure moves of whole top-level declarations, same package cli, zero behavior change:

New file	Moved verbatim
data_ingest_cmd.go	newDataIngestCmd (full flag surface incl. hidden deprecated aliases) + runDataIngestArgs
data_ingest_local.go	sortedKeys, expandHome, statDatasetPath, printLocalSummary, runLocalPreflight
data_ingest_cluster.go	runIngestionRun, shouldReclaimStaging, printClusterSummary, the cluster test seams, destTableExists, existingTableAction
data_ingest_output.go	pushJSONResult/pushJSONSummary, writePushJSON/writePushErrorJSON, classifyPushOutcome — writePushJSON + classifyPushOutcome deliberately kept in one file (mutation-hardened lockstep)

data.go (693 lines) keeps the data group command, the deprecation-alias notice, and runDataIngest itself — its extraction is the follow-up (#283).

The only new text is each file's header comment + package/import clauses. Every moved section was verified byte-for-byte against the pre-split file with a line-range check (every non-blank line of the old file lands verbatim in exactly one new location). data_test.go is untouched.

Fixes #282
Part of tracebloc/backend#1106.

Type of change

• Bug fix
• New feature
• Refactor (no functional change)
• Docs
• CI/build

Test plan

Ran locally:

• go build ./... — clean
• go test ./... — full suite green (internal/cli 5.5s, all packages pass)
• go vet ./internal/cli/ + gofmt -s -l . — clean
• Verbatim-move verification script (line-range containment + full coverage of the original file) — PASS

Checklist

• Tests pass locally
• gofmt/vet clean
• No behavior change intended; data_test.go compiles unchanged

---

Stacked PR 1/4 of the WS-B data.go chain — merge order: #this → cli#283 → cli#284 → cli#285. Each later branch is based on the previous one; merge this first, the rest rebase trivially.

🤖 Generated with Claude Code

---

Note

Low Risk
Pure file moves within package cli with tests and build reported green; no logic or API changes beyond organization.

Overview
Mechanically splits the oversized internal/cli/data.go (~1.5k lines) into four same-package files so ingest concerns are easier to navigate, with no intended behavior change.

• data_ingest_cmd.go — newDataIngestCmd, flags, and runDataIngestArgs
• data_ingest_local.go — local path helpers, printLocalSummary, runLocalPreflight
• data_ingest_cluster.go — runIngestionRun, destination-table guards, cluster test seams
• data_ingest_output.go — --output-json types/writers and classifyPushOutcome

data.go now holds the data group command, deprecation-alias wiring, and runDataIngest orchestration (~693 lines). Imports on data.go were trimmed to match what stayed. data_test.go is unchanged.

^{Reviewed by Cursor Bugbot for commit 9f75c1d. Bugbot is set up for automated code reviews on this repo. Configure here.}

[LukasWodka]

👋 Heads-up — Code review queue is at 41 / 30

Above the WIP limit. The team convention is to review existing PRs before opening new work.

Open PRs currently in Code review (oldest first):

• averaging-service#181 — feat(weights): normalize-on-read — mixed cycles average instead of rejecting (SEC-03 §8 step 2) · author: @shujaatTracebloc · no reviewer assigned
• averaging-service#182 — feat(weights): averaging writes SafeTensors (TF + PyTorch) — SEC-03 §8 step 4 · author: @shujaatTracebloc · no reviewer assigned
• backend#1079 — feat(global_meta): edge dataset_meta exposure + attributes contract at ingest (#924 G4a) · author: @divyasinghds · no reviewer assigned
• backend#1086 — docs(rfc): SafeTensors weight-format migration — SEC-03 Phase 1 (RFC 0004) · author: @shujaatTracebloc · no reviewer assigned
• backend#1093 — chore(deps): bump django from 5.2.14 to 5.2.15 · author: @dependabot · no reviewer assigned
• backend#1095 — feat(experiment): configurable preprocessing knobs incl. tabular scaler — RFC 0003 L1 + L1b (#1094) · author: @LukasWodka · no reviewer assigned
• backend#1100 — fix(boot): pin SDK install to tracebloc==0.11.2, drop 404 dev line (#1098) · author: @LukasWodka · reviewer: @saqlainsyed007
• backend#1105 — perf(api): query micro-fixes — notifications N+1, cached data_scientist, composite index, sampling (#975) · author: @aptracebloc · no reviewer assigned
• cli#266 — main - > enhance CLI features and tests · author: @saadqbal · no reviewer assigned
• cli#278 — fix(deps): toolchain go1.26.5 + x/net v0.57.0 — clear 6 reachable vulns; govulncheck CI gate · author: @LukasWodka · reviewer: @saadqbal

Pull from review before opening new work. (This is a nudge from the kanban WIP check, not a block.)

[LukasWodka]

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^{Reviewed by Cursor Bugbot for commit 9f75c1d. Configure here.}

[saadqbal]

👍 Verified it's a faithful mechanical split — line accounting reconciles exactly (data.go 1539→693, the 846 moved lines land in the 4 per-concern files), retained symbols keep identical signatures, and Test + all builds are green. Nice separation (cmd / local / cluster / output).