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-growth.json.golden

@@ -1,12 +1,4 @@
 exit: 0
 --- stdout
-{
-  "revenue_growth": 0.081,
-  "earnings_growth": 0.121,
-  "revenue_growth_pct": 8.1,
-  "earnings_growth_pct": 12.1,
-  "revenue_signal": "slow",
-  "earnings_signal": "moderate",
-  "overall_signal": "mixed"
-}
+{"revenue_growth":0.081,"earnings_growth":0.121,"revenue_growth_pct":8.1,"earnings_growth_pct":12.1,"revenue_signal":"slow","earnings_signal":"moderate","overall_signal":"mixed"}
 --- stderr