docs: smoke testing

docs/SMOKE.md

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+# Smoke Checks
+
+Use `scripts/live-smoke.sh` as the reusable smoke runner for shipped CLI surfaces.
+
+The script:
+- builds `target/debug/idx` once by default
+- isolates config, cache, and data under `tmp/live-smoke/<timestamp>/`
+- records one log file per case under `tmp/live-smoke/<timestamp>/logs/`
+- supports fast mock-backed runs and slower live-network passes
+
+## Common Runs
+
+```bash
+scripts/live-smoke.sh
+scripts/live-smoke.sh --mode full
+scripts/live-smoke.sh --mode mock
+scripts/live-smoke.sh --group live-table --group live-json
+scripts/live-smoke.sh --group cache --symbol BBRI
+scripts/live-smoke.sh --dry-run --mode full
+```
+
+## Modes
+
+- `live` runs the default real-network baseline: `general`, `live-table`, and `ownership`
+- `mock` runs the deterministic baseline: `general`, `mock`, `cache`, `routing`, `errors`, and `ownership`
+- `full` runs every group, including live JSON output checks
+
+## Groups
+
+- `general`: `version`, `completions`, `config`, and `cache` command basics
+- `live-table`: all shipped `stocks` commands in live table mode
+- `live-json`: all shipped `stocks` commands in live JSON mode
+- `mock`: all shipped `stocks` commands against the mock provider in both table and JSON mode
+- `cache`: cache warm, `--offline`, and stale-cache fallback checks for quote, technical, and MSN `profile`
+- `routing`: Yahoo/MSN provider routing plus explicit MSN history unsupported behavior
+- `errors`: JSON error contract and invalid flag/input checks
+- `ownership`: safe ownership smoke checks that do not require imported ownership data
+
+## Notes
+
+- The runner forces `IDX_OUTPUT=table` as its default environment so table cases stay stable; JSON checks use `-o json` explicitly.
+- Ownership commands that need imported data are intentionally not part of the baseline runner yet. The current baseline only covers `ownership releases` and the known unsupported `ownership import --fetch-bing`.
+- When a case fails, inspect the per-case log in `tmp/live-smoke/.../logs/` before updating `TODO.md` or `FEATURE_SPEC.md`.