devex: route script-shell via TLON_SHELL so windows can use git bash

[jamesacklin]

Summary

Several package.json scripts use Unix shell tools (rm -rf, cp -R, mkdir -p) that fail on Windows' default cmd.exe. Pointing pnpm's script-shell at ${TLON_SHELL-/bin/bash} lets Windows contributors set TLON_SHELL to Git Bash without rewriting any existing scripts; Unix users keep /bin/bash automatically via the default-value expansion. Documents the Windows setup in CLAUDE.md, including the WSL-bash trap on PATH and the Node 22 pin needed for prebuilt better-sqlite3 binaries.

Changes

• Tells pnpm to run all package.json scripts through whatever $TLON_SHELL points to, falling back to /bin/bash when the env var is unset
• Updates CLAUDE.md to tell the robots what to do when initializing on Windows

How did I test?

Risks and impact

• Safe to rollback without consulting PR author? Yes
• Affects important code area:
  • Onboarding
  • State / providers
  • Message sync
  • Channel display
  • Notifications
  • Other: dev environment

Rollback plan

git revert

Screenshots

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