feat(cli): agent-native output, stdin symbols, and exit-code classes

Phase 1 of docs/DESIGN.md:

- Output format resolves -o > IDX_OUTPUT > general.output > auto; auto
  is a table on a terminal and JSON when stdout is piped or captured.
  `config init` now writes output = "auto".
- JSON is pretty only on a terminal and compact otherwise. New `-o
  jsonl` prints one array item per line with the same key order.
- No ANSI color when stdout is not a terminal (direct owo-colors calls
  now go through output::style).
- `stocks quote -` and `stocks compare -` read symbols from stdin.
- Exit codes by class: 2 invalid input/config, 3 not found or cache
  miss, 4 upstream unavailable, 5 unsupported, 1 other.

Golden changes are limited to those documented kinds and were verified
mechanically: JSON goldens are semantically identical, tables differ
only by removed ANSI codes and the column padding comfy-table had
reserved for them (cell contents identical), exit codes match each
error's class, and help/completions only gain the new --output values.
17 new golden cases cover auto, jsonl, stdin, and the new errors.

tests/cli.rs now pins IDX_OUTPUT=table in its harness (its tests assert
table text and run piped) and parses discover JSON instead of matching
pretty-printed whitespace.

Live A/B against main: 16/16 stocks cases identical; ownership discover
got IDX 403 on both binaries, now exiting 4 instead of 1 as intended.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/golden/stocks-technical.json.golden

@@ -1,28 +1,4 @@
 exit: 0
 --- stdout
-{
-  "symbol": "BBCA.JK",
-  "as_of": "2024-03-03",
-  "current_price": 9925,
-  "sma20": null,
-  "sma50": null,
-  "sma200": null,
-  "rsi14": null,
-  "macd": {
-    "line": null,
-    "signal": null,
-    "histogram": null
-  },
-  "volume": {
-    "current": 14000000,
-    "average20": null,
-    "ratio20": null
-  },
-  "signals": {
-    "rsi": "Neutral",
-    "macd": "Neutral",
-    "trend": "Neutral",
-    "overall": "Neutral"
-  }
-}
+{"symbol":"BBCA.JK","as_of":"2024-03-03","current_price":9925,"sma20":null,"sma50":null,"sma200":null,"rsi14":null,"macd":{"line":null,"signal":null,"histogram":null},"volume":{"current":14000000,"average20":null,"ratio20":null},"signals":{"rsi":"Neutral","macd":"Neutral","trend":"Neutral","overall":"Neutral"}}
 --- stderr