Initial project setupHEADmain

Add modal-shell project with .agent/ config, mode stubs, ms dispatcher,
bare repo at /site/git.terst.org/repos/modal-shell.git, and ADR-001.

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+# Preferences
+
+*Living record. Update when new preferences are revealed.*
+
+## Interaction Style
+
+- Concise responses. No trailing summaries restating what was just done.
+- Present strategy before execution for anything non-trivial.
+- Ask when ambiguous rather than assuming.
+
+## Technical Preferences
+
+- bash over zsh for portability, but `base.sh` must be zsh-compatible for direct sourcing.
+- `direnv` for automatic environment loading — preferred over manual `source` steps.
+- Secrets via 1Password CLI (`op run --`) where available.
+- `just` preferred over `make` for new task runners, but don't add it as a dep if the project doesn't already use it.
+
+## What to Avoid
+
+- Adding frameworks or dependencies that aren't already present.
+- Clever shell tricks that obscure intent. Readable over terse.
+- Modes that do more than one thing.