docs(cli): help for config keys and output, changes dates, alias search

`idx config --help` lists the keys and says when it prints JSON;
`ownership changes` says both dates must be imported releases and that
accounts are summed; `ownership search` and `entity` describe alias and
substring matching. Regenerated the CLI reference page.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01V3syn2fN2LNo5pvTSqc6eh

crates/idx-cli/tests/golden/help-config.golden

@@ -1,6 +1,8 @@
 exit: 0
 --- stdout
-Manage configuration
+Manage configuration in ~/.config/idx/config.toml (or $XDG_CONFIG_HOME/idx/config.toml).
+
+Results print as plain text, even when piped, so `$(idx config path)` works in scripts. Ask for JSON with `-o json`, `IDX_OUTPUT=json`, or `general.output = "json"`.
 
 Usage: idx config [OPTIONS] <COMMAND>
 
@@ -12,11 +14,37 @@ Commands:
   help  Print this message or the help of the given subcommand(s)
 
 Options:
-  -o, --output <OUTPUT>  Output format [default: auto = table on a terminal, json when piped] [possible values: auto, table, json, jsonl]
-      --no-color         Disable colored output
-  -q, --quiet            Suppress non-essential output
-  -v, --verbose...       Increase verbosity (-v, -vv)
-      --offline          Run without network requests
-      --no-cache         Bypass local cache
-  -h, --help             Print help
+  -o, --output <OUTPUT>
+          Output format [default: auto = table on a terminal, json when piped]
+          
+          [possible values: auto, table, json, jsonl]
+
+      --no-color
+          Disable colored output
+
+  -q, --quiet
+          Suppress non-essential output
+
+  -v, --verbose...
+          Increase verbosity (-v, -vv)
+
+      --offline
+          Run without network requests
+
+      --no-cache
+          Bypass local cache
+
+  -h, --help
+          Print help (see a summary with '-h')
+
+Keys:
+  general.provider, general.history_provider, general.exchange, general.output,
+  general.color, cache.quote_ttl, cache.fundamental_ttl, ownership.db_path,
+  ownership.snapshot_manifest
+
+Examples:
+  idx config init
+  idx config set general.output json
+  idx config get cache.quote_ttl
+  idx config path
 --- stderr

crates/idx-cli/tests/golden/help-ownership.golden

@@ -15,7 +15,7 @@ Commands:
   sync           Install or refresh a maintained ownership SQLite snapshot
   ticker         Show all holders for a ticker (KSEI + Bing combined)
   entity         Show all holdings for an entity across tickers
-  search         Search entities by name
+  search         Search entities by name or KSEI alias
   cross-holders  Rank entities by cross-ownership breadth
   concentration  Rank tickers by ownership concentration
   flow           Show Bing institutional flow for a ticker