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/yahoo-history.json.golden

@@ -1,29 +1,4 @@
 exit: 0
 --- stdout
-[
-  {
-    "date": "2024-03-01",
-    "open": 9800,
-    "high": 9900,
-    "low": 9750,
-    "close": 9875,
-    "volume": 12300000
-  },
-  {
-    "date": "2024-03-02",
-    "open": 9850,
-    "high": 9920,
-    "low": 9800,
-    "close": 9880,
-    "volume": 11000000
-  },
-  {
-    "date": "2024-03-03",
-    "open": 9860,
-    "high": 9950,
-    "low": 9820,
-    "close": 9925,
-    "volume": 14000000
-  }
-]
+[{"date":"2024-03-01","open":9800,"high":9900,"low":9750,"close":9875,"volume":12300000},{"date":"2024-03-02","open":9850,"high":9920,"low":9800,"close":9880,"volume":11000000},{"date":"2024-03-03","open":9860,"high":9950,"low":9820,"close":9925,"volume":14000000}]
 --- stderr