navi_code was strictly local: no web, no remote hosts, no image viewing. That
made it lean on the developer profile whenever a coding task needed a doc
lookup or a remote command. Bring those capabilities in so navi_code covers
full coding work itself, while staying terminal-first and local-by-default.

config: agent gains image_view, ssh_exec, and the navi-web MCP (search/browse/
request); subagent gains image_view + navi-web (no ssh_exec — sub-agents don't
reach remote hosts, matching developer). Description/short_description/
full_description updated to "terminal-first with web and remote access". Also
includes the gemma4:12b-it-qat-128k model in the model list (local 128k-context
option alongside 31b-cloud).

prompt: soften "Local-only, no remote hosts" to "local by default, with web
lookup (docs/APIs) and ssh (remote ops) when the task needs it". Add compact
Web lookup and Remote access sections under Execution environment, and update
the sub-agent toolset briefing to list image_view + web and to exclude ssh_exec.
scope_boundary still applies; ssh destructive/system-wide actions need user
confirmation. Kept additions minimal to avoid bloating the prompt for the 12b
model.