Fix README help block and move changelog entries after v0.2.4 release

The v0.2.4 release emptied the README help code block and moved all
changelog entries to the release section. Regenerate the help block
and move unreleased entries to the new [Unreleased] section.

https://claude.ai/code/session_01JCmVVCvBbxPUrxy3BcgjCc

Author: claude

CHANGELOG.md

@@ -12,6 +12,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `--json` output documentation in `--help` for all commands, describing the MCP object shape returned
 - `tools-get` now shows an example `tools-call` command with placeholder arguments based on the tool's schema
 
+### Fixed
+
+- `build:readme` script failing on macOS due to `sed -i` platform difference
+
 ## [0.2.4] - 2026-04-07
 
 ### Security
@@ -24,7 +28,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 
 - Bridge ignores stored OAuth access token when no refresh token is provided; servers that don't issue refresh tokens now work correctly by using the access token as a static Bearer header
-- `build:readme` script failing on macOS due to `sed -i` platform difference
 - Session incorrectly marked as `unauthorized` when access token expires but refresh token is still valid; bridge now attempts token refresh before giving up
 - "ESC to detach" hint now shows immediately in the spinner when using `--task`, instead of waiting for the server to return a task ID
 

README.md

@@ -106,6 +106,53 @@ mcpc @fs tools-list
 <!-- AUTO-GENERATED: mcpc --help -->
 
 ```
+Usage: mcpc [<@session>] [<command>] [options]
+
+Universal command-line client for the Model Context Protocol (MCP).
+
+Commands:
+  connect <server> <@session>  Connect to an MCP server and start a new named @session
+  close <@session>             Close a session
+  restart <@session>           Restart a session (losing all state)
+  shell <@session>             Open interactive shell for a session
+  login <server>               Interactively login to a server using OAuth and save profile
+  logout <server>              Delete an OAuth profile for a server
+  clean [resources...]         Clean up mcpc data (sessions, profiles, logs, all)
+  grep <pattern>               Search tools and instructions across all active sessions
+  x402 [subcommand] [args...]  Configure an x402 payment wallet (EXPERIMENTAL)
+  help [command] [subcommand]  Show help for a specific command
+
+Options:
+  -j, --json                   Output in JSON format for scripting
+  --verbose                    Enable debug logging
+  --profile <name>             OAuth profile for the server ("default" if not provided)
+  --schema <file>              Validate tool/prompt schema against expected schema
+  --schema-mode <mode>         Schema validation mode: strict, compatible (default), ignore
+  --timeout <seconds>          Request timeout in seconds (default: 300)
+  --insecure                   Skip TLS certificate verification (for self-signed certs)
+  -v, --version                Output the version number
+  -h, --help                   Display help
+
+MCP session commands (after connecting):
+  <@session>                   Show MCP server info, capabilities, and tools
+  <@session> grep <pattern>    Search tools and instructions
+  <@session> tools-list        List all server tools
+  <@session> tools-get <name>  Get tool details and schema
+  <@session> tools-call <name> [arg:=val ... | <json> | <stdin]
+  <@session> prompts-list
+  <@session> prompts-get <name> [arg:=val ... | <json> | <stdin]
+  <@session> resources-list
+  <@session> resources-read <uri>
+  <@session> resources-subscribe <uri>
+  <@session> resources-unsubscribe <uri>
+  <@session> resources-templates-list
+  <@session> tasks-list
+  <@session> tasks-get <taskId>
+  <@session> tasks-cancel <taskId>
+  <@session> logging-set-level <level>
+  <@session> ping
+
+Run "mcpc" without arguments to show active sessions and OAuth profiles.
 ```
 
 ### General actions