[codex] Improve mobile org chart navigation (#4127)

## Thinking Path

> - Paperclip models companies as teams of human and AI operators
> - The org chart is the primary visual map of that company structure
> - Mobile users need to pan and inspect the chart without awkward
gestures or layout jumps
> - The roadmap also needed to reflect that the multiple-human-users
work is complete
> - This pull request improves mobile org chart gestures and updates the
roadmap references
> - The benefit is a smoother company navigation experience and docs
that match shipped multi-user support

## What Changed

- Added one-finger mobile pan handling for the org chart.
- Expanded org chart test coverage for touch gesture behavior.
- Updated README, ROADMAP, and CLI README references to mark
multiple-human-users work as complete.

## Verification

- `pnpm install --frozen-lockfile --ignore-scripts`
- `pnpm exec vitest run ui/src/pages/OrgChart.test.tsx`
- Result: 4 tests passed.

## Risks

- Low-medium risk: org chart pointer/touch handling changed, but the
behavior is scoped to the org chart page and covered by targeted tests.

> For core feature work, check [`ROADMAP.md`](ROADMAP.md) first and
discuss it in `#dev` before opening the PR. Feature PRs that overlap
with planned core work may need to be redirected — check the roadmap
first. See `CONTRIBUTING.md`.

## Model Used

- OpenAI Codex coding agent based on GPT-5, tool-enabled local shell and
GitHub workflow, exact runtime context window not exposed in this
session.

## Checklist

- [x] I have included a thinking path that traces from project context
to this change
- [x] I have specified the model used (with version and capability
details)
- [x] I have checked ROADMAP.md and confirmed this PR does not duplicate
planned core work
- [x] I have run tests locally and they pass
- [x] I have added or updated tests where applicable
- [x] If this change affects the UI, I have included before/after
screenshots, or documented why targeted interaction tests are sufficient
here
- [x] I have updated relevant documentation to reflect my changes
- [x] I have considered and documented any risks above
- [x] I will address all Greptile and reviewer comments before
requesting merge

---------

Co-authored-by: Paperclip <noreply@paperclip.ing>

cli/README.md

@@ -258,7 +258,7 @@ See [doc/DEVELOPING.md](https://github.com/paperclipai/paperclip/blob/master/doc
 - ⚪ Artifacts & Deployments
 - ⚪ CEO Chat
 - ⚪ MAXIMIZER MODE
-- ⚪ Multiple Human Users
+- ✅ Multiple Human Users
 - ⚪ Cloud / Sandbox agents (e.g. Cursor / e2b agents)
 - ⚪ Cloud deployments
 - ⚪ Desktop App