[Contribution Series] dev-setup → progress → perf → regex → remap → null-strategy fix

[GALHP]

Upstreaming work from GALHP/clonio-cli:
a stacked series of five features (please review/merge bottom-up — each PR's
diff shrinks to just its own change once the ones below it land) plus one
independent bugfix.

PRs

• Docker based Development Setup #165 — feat/development-setup → base main · tooling (optional)
• Progress and Performance Tracking #166 — feat/progress-and-performance-tracking → base Docker based Development Setup #165 · feature
• Improve Chunked Insert Performance #167 — feat/improve-chunked-insert-performance → base Progress and Performance Tracking #166 · feature (perf) · depends on Progress and Performance Tracking #166 in code
• Regex Table Names #168 — feat/regex-table-names → base Improve Chunked Insert Performance #167 · feature
• Remapping Keys as Config Option #169 — feat/remapping-keys-as-config-option → base Regex Table Names #168 · feature
• Fix Transformation Strategy 'null' #170 — fix/transformation-strategy-null → base Remapping Keys as Config Option #169 · bugfix (unquoted null column strategy broke dumped configs)

Dependency graph

#165 development-setup ──▶ #166 progress ──▶ #167 chunked-insert-perf ──▶ #168 regex ──▶ #169 remap-keys ──▶ #170 fix-null-strategy
   (tooling)              (feature)        (needs #166's stats model)   (feature)     (feature)       (bugfix)

Why the two dev-oriented PRs (#165, #166) exist

• Docker based Development Setup #165 development-setup — pure local tooling (Docker Compose + make) to
  build/test in a container; also fixes two init IO-error tests that assumed a
  non-root user (chmod is a no-op under the container's root). No runtime
  behavior, entirely optional.
• Progress and Performance Tracking #166 progress-and-performance-tracking — began as a diagnostic aid: a
  ~25M-row clone ran for hours with no visibility. Per-phase timing + live bars
  made the bottleneck measurable (→ led to Improve Chunked Insert Performance #167), and stands alone as a UX win
  (-v/-vv/-vvv).

Flexible to your process

On request I'll rebase any PR onto main (or any other base/state):

• Docker based Development Setup #165 — drop freely (tooling only).
• Progress and Performance Tracking #166 — droppable, but Improve Chunked Insert Performance #167 uses its timing/stats model in
  CloningRunOrchestrator; landing Improve Chunked Insert Performance #167 without Progress and Performance Tracking #166 needs a small rework to drop the
  Stats*/TableRunPhase references.
• Regex Table Names #168 (regex) and Remapping Keys as Config Option #169 (remap-keys) don't depend on Docker based Development Setup #165–Improve Chunked Insert Performance #167 in code — I can
  rebase them straight onto main as standalone PRs (minor RunCommand/validator
  conflicts, easily resolved).
• Fix Transformation Strategy 'null' #170 is independent

Quality

The full stack passes composer test (Pest unit+feature, PHPStan max, Pint,
Rector); each feature adds tests, and the perf/regex/remap/fix changes were
verified end-to-end against SQLite.