Tell the atomic Planner its members can't run slash commands

Atomic's workflow guidance tells the model to point people at
/workflow connect, so the Planner told Chopin members to run a command
they have no way to type. The atomic Planner's instructions now say that
members use Chopin in a browser, that slash, terminal, and Atomic CLI
commands are unavailable to them, and that a started workflow is
followed through its run card in Chat, Decisions, and Stop or Resume
Planner, with the Planner offering to check on or steer the run itself.

Assistant-model: Claude Opus 5.5
Assistant-workflow: inline
Assistant-verification: bun test passed: session and agent tests (67 pass), including the instruction text for checkout and scratch workspaces and its absence for isolated harnesses
Assistant-verification: bun run types passed: all workspaces
Assistant-verification: bun run ci passed: dprint, oxlint, tokens, type scale, Impeccable (no new findings)
User-preference: Chopin members can't run slash commands; the Planner should point them to Chopin's own UI instead of /workflow connect
Co-authored-by: Alex Lavaee <lavaman131@github.com>