docs(readme): document rc implementation and parity checklist

README.md

@@ -35,8 +35,17 @@ Implemented commands:
 - `link [CASTLE]`
 - `unlink [CASTLE]`
 - `track FILE [CASTLE]`
+- `rc [CASTLE]`
 - `version`
 
+### rc behavior
+
+- Runs executable scripts in `<castle>/.homesick.d/` in lexicographic order.
+- Executes scripts with the castle root as the current working directory.
+- Forwards script stdout/stderr to command output.
+- If `<castle>/.homesickrc` exists and `<castle>/.homesick.d/parity.rb` does not, generates `parity.rb` before execution.
+- Never overwrites an existing `parity.rb` wrapper.
+
 Not yet implemented:
 
 - `pull`
@@ -47,9 +56,28 @@ Not yet implemented:
 - `open`
 - `exec`
 - `exec_all`
-- `rc`
 - `generate`
 
+## Outstanding Feature Checklist
+
+Command parity:
+
+- [ ] `pull`
+- [ ] `push`
+- [ ] `commit`
+- [ ] `destroy`
+- [ ] `cd`
+- [ ] `open`
+- [ ] `exec`
+- [ ] `exec_all`
+- [ ] `generate`
+
+Historical flag/behavior parity:
+
+- [ ] `pull --all`
+- [ ] `rc --force`
+- [ ] Evaluate whether global `pretend`/`quiet` modes should be restored
+
 ## Behavior Suite
 
 The repository includes a Docker-based behavior suite that validates filesystem and git outcomes for the implemented commands.