Fix the 4 real CodeQL path-injection alerts (open_conventions_pr trusted the
API-settable project.workspace_path with no containment) plus defense-in-depth
segment validation at the get_workspace_path chokepoint. Bump next 16.1.1->16.1.7
and transitive lockfile deps to clear 24 Dependabot alerts. Close the intake
subagent-ban gap: the Claude intake driver still carried the Task tool and the
prompter prompt told it to fan out research subagents, contradicting the
fleet-wide ban. The remaining 47 CodeQL + 29 Dependabot alerts are dismissed on
GitHub with per-alert justifications (guard patterns CodeQL can't model across
call hops; next 16.2.x blocked by the verified tab-hostage router regression).
Co-authored-by: Renn F <rennf93@users.noreply.github.com>
