Mount current working directory at /workspace in all modes (dual-mount)

[Copilot]

rstudio mode only mounted ~/dockerhome → /home/rstudio, leaving the current working directory inaccessible inside the container. bash and R modes already mounted both.

Changes

• rstudio docker run: adds -v "$(pwd)":/workspace so the working directory is immediately available in RStudio at /workspace
• Startup message: notes the /workspace mount alongside the existing home/packages message
• Help text + README: updated to reflect all modes now provide dual-mounting

Mount semantics

Mount	Purpose
~/dockerhome → /home/rstudio	Persistent home — R config, packages, intentional file copies; host is otherwise isolated
$(pwd) → /workspace	Live working directory — project files accessible immediately, changes reflected on host in real time

The two mounts are non-conflicting and complementary.

Original prompt

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This section details on the original issue you should resolve

<issue_title>dual-mounting both a persistent home directory and the current working directory</issue_title>
<issue_description>An additional thought, we now have RStudio home directory mounted on host directory ~/dockerhome, and current working host directory mounted on docker directory /workspace. The original is useful for making files created in Docker available after exit or for intentional copying of certain files to ~/dockerhome while not exposing any other user files to Docker, whereas the latter makes the current working directory immediately available in Docker. I find the latter more useful and I don't think there is harm in providing both, but merits discussion.

Originally posted by @lwaldron in #21 (comment)
</issue_description>

<agent_instructions>Please weigh the differences between the mounting strategies and provide a summary of both. </agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes dual-mounting both a persistent home directory and the current working directory #22

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