feat: Add local cloud provider for running agents on local machine (#381)

Adds a "local" cloud provider that installs and runs agents directly on the
user's machine without any cloud provisioning. This is useful for local
development and testing.

- local/lib/common.sh: Cloud lib with local execution functions
- local/claude.sh: Claude Code agent script
- local/openclaw.sh: OpenClaw agent script
- local/nanoclaw.sh: NanoClaw agent script
- manifest.json: Added local cloud + matrix entries
- test/: Updated record.sh and mock.sh for local cloud support

Fixes #378

Agent: issue-fixer

Co-authored-by: A <6723574+louisgv@users.noreply.github.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

test/record.sh

@@ -1400,7 +1400,7 @@ list_clouds() {
     total_count=$(echo "$ALL_RECORDABLE_CLOUDS" | wc -w | tr -d ' ')
     printf '%b\n' "  ${ready_count}/${total_count} clouds have credentials set"
     printf '\n'
-    printf "  CLI-based clouds (not recordable): sprite, gcp, e2b, modal, fly, daytona, northflank, runpod, vastai, koyeb\n"
+    printf "  CLI-based clouds (not recordable): sprite, gcp, e2b, modal, fly, daytona, northflank, runpod, vastai, koyeb, local\n"
 }
 
 # --- Main ---