feat: add mcpctl mcp STDIO bridge, rework config claude

- New `mcpctl mcp -p PROJECT` command: STDIO-to-StreamableHTTP bridge
  that reads JSON-RPC from stdin and forwards to mcplocal project endpoint
- Rework `config claude` to write mcpctl mcp entry instead of fetching
  server configs from API (no secrets in .mcp.json)
- Keep `config claude-generate` as backward-compat alias
- Fix discovery.ts auth token not being forwarded to mcpd (RBAC bypass)
- Update fish/bash completions for new commands
- 10 new MCP bridge tests, updated claude tests, fixed project-discovery test

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

completions/mcpctl.fish

@@ -3,7 +3,7 @@
 # Erase any stale completions from previous versions
 complete -c mcpctl -e
 
-set -l commands status login logout config get describe delete logs create edit apply backup restore help
+set -l commands status login logout config get describe delete logs create edit apply backup restore mcp help
 set -l project_commands attach-server detach-server get describe delete logs create edit help
 
 # Disable file completions by default
@@ -196,12 +196,12 @@ complete -c mcpctl -n "__fish_seen_subcommand_from login" -l email -d 'Email add
 complete -c mcpctl -n "__fish_seen_subcommand_from login" -l password -d 'Password' -x
 
 # config subcommands
-set -l config_cmds view set path reset claude-generate impersonate
+set -l config_cmds view set path reset claude claude-generate impersonate
 complete -c mcpctl -n "__fish_seen_subcommand_from config; and not __fish_seen_subcommand_from $config_cmds" -a view -d 'Show configuration'
 complete -c mcpctl -n "__fish_seen_subcommand_from config; and not __fish_seen_subcommand_from $config_cmds" -a set -d 'Set a config value'
 complete -c mcpctl -n "__fish_seen_subcommand_from config; and not __fish_seen_subcommand_from $config_cmds" -a path -d 'Show config file path'
 complete -c mcpctl -n "__fish_seen_subcommand_from config; and not __fish_seen_subcommand_from $config_cmds" -a reset -d 'Reset to defaults'
-complete -c mcpctl -n "__fish_seen_subcommand_from config; and not __fish_seen_subcommand_from $config_cmds" -a claude-generate -d 'Generate .mcp.json'
+complete -c mcpctl -n "__fish_seen_subcommand_from config; and not __fish_seen_subcommand_from $config_cmds" -a claude -d 'Generate .mcp.json for project'
 complete -c mcpctl -n "__fish_seen_subcommand_from config; and not __fish_seen_subcommand_from $config_cmds" -a impersonate -d 'Impersonate a user'
 
 # create subcommands