v3.7.0 — Quick Wins: resume, redo, live ticker, diffstat, first-run picker

Quick-win batch — session resume, redo, live cost ticker, diffstat, and a friendlier first run.

Added

• `kodiqa -c` / `--continue` — resume the most recent session immediately, skipping the prompt.
• `--resume [ID]` — resume a specific saved history session by id (most recent when no id is given).
• `/redo` — re-apply the most recently undone edit. Per-file redo stack alongside `/undo`; any fresh edit invalidates redo.
• Live cost/token ticker — while a response streams, the status line shows an estimated `~N tok ~$X` (reconciled from real usage at end of turn). Hidden for local/free models.
• End-of-turn diffstat — a `✎ N files changed, +x −y` rollup after each turn (per-file breakdown when >1 file), across all permission modes.
• First-run provider picker — first launch offers all 7 providers (Claude + OpenAI/DeepSeek/Groq/Mistral/Qwen + local-only) via the arrow-key selector, and sets the chosen provider's default model.

Changed

• Friendlier API errors — connection failures and timeouts print an actionable hint instead of a raw exception; the Ollama connection error suggests `ollama serve`.

Tests

• Added regressions for redo, the change-log/diffstat rollup, the live ticker, and `--resume` history loading (317 total).