Bugfixes, add INFO command, graceful shutdown. elimitate dead code

- Remove unsed handleClientKill, handleClientKill
- Fix misleading error message on rate limit
- Eliminated unused channel-to-pattern index that was causing unnecessary work
- Fixed O(n²) duplicate check in PublishToPattern
- Limit total pattern subscriptions to 10,000
- Limit channel subscriptions per client to 10,000
- Added INFO command
- Added graceful shutdown timeout
- Validate that log directory is writable during config load
- Make SELECT properly handle whitespace around DB index like Redis
- Return proper error instead of empty array for unsupported commands on sharded pubsub stubs
- More accurate error messages throughout
- Updated README.md

README.md

@@ -153,6 +153,7 @@ On Linux, macOS, and BSD, if `--config` is given the specified file is used dire
 | `log_level` | string | `"info"` | Logging level: debug, info, warn, error |
 | `log_file` | string | `""` | Log file path (empty = stdout only) |
 | `pid_file` | string | `""` | PID file path (empty = no PID file) |
+| `shutdown_timeout` | int | `30` | Graceful shutdown timeout in seconds (0 = wait forever) |
 
 If you don't provide a config file, sensible defaults are used.
 
@@ -246,6 +247,26 @@ PING hello
 # Returns: +hello
 ```
 
+### SELECT
+
+Switch to a different database (0-15). In Pekoe this is a no-op since there's no persistent data, but it maintains client compatibility.
+
+```bash
+SELECT 5
+# Returns: +OK
+```
+
+### INFO
+
+Returns comprehensive server information in Redis-compatible format.
+
+```bash
+INFO
+# Returns: # Server\r\nredis_version:...\r\n...
+```
+
+Returns sections: Server, Clients, Memory, Persistence, Stats, Replication, CPU, Keyspace.
+
 ### PUBSUB
 
 Introspection commands for monitoring:
@@ -418,8 +439,11 @@ Test coverage includes:
 - Basic SUBSCRIBE/PUBLISH/UNSUBSCRIBE
 - Pattern PSUBSCRIBE/PUNSUBSCRIBE with wildcards
 - Multiple channel/pattern subscriptions
-- PUBSUB NUMSUB, CHANNELS, NUMPAT commands
+- PUBSUB NUMSUB, CHANNELS, NUMPAT, SHARDCHANNELS, SHARDNUMSUB, HELP commands
 - PING command (with and without message)
+- SELECT database switching (for client compatibility)
+- INFO server information
+- CLIENT ID, SETNAME, GETNAME, LIST, INFO, KILL, PAUSE, REPLY commands
 - Binary-safe messages
 - Empty and long messages
 - Unicode content