chore: add GitHub templates, CODE_OF_CONDUCT, CODEOWNERS, update copilot-instructions

.github/CODEOWNERS

@@ -0,0 +1 @@
+* @cdprice02

.github/CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+Contributors to ferrish are expected to engage respectfully and constructively.
+
+## What we expect
+
+- Critique ideas, not people. Technical disagreement is welcome; personal attacks are not.
+- Keep discussion focused on the work — the code, the design, the problem being solved.
+- Be direct and honest, but remain considerate of others.
+
+## What is not acceptable
+
+- Harassment, insults, or discriminatory language in any form.
+- Sustained hostility toward contributors, regardless of the context.
+
+## Reporting
+
+If you experience or witness conduct that violates these expectations, contact the project maintainer directly: @cdprice02.

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a bug in ferrish
+labels: bug
+---
+
+## Steps to reproduce
+
+1. 
+2. 
+3. 
+
+## Expected behavior
+
+<!-- What did you expect to happen? -->
+
+## Actual behavior
+
+<!-- What actually happened? Include error output if applicable. -->
+
+## Environment
+
+- ferrish version: <!-- e.g. 0.1.0 or commit SHA -->
+- OS: <!-- e.g. macOS 14.4, Ubuntu 22.04 -->
+- Rust version: <!-- rustc --version -->

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest a new feature or improvement for ferrish
+labels: enhancement
+---
+
+## Problem statement
+
+<!-- What are you trying to do? What is the limitation or gap you're running into? -->
+
+## Proposed solution
+
+<!-- Describe your proposed solution or change. Be as specific as possible. -->
+
+## Alternatives considered
+
+<!-- Have you tried any workarounds or alternative approaches? What were their trade-offs? -->

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+
+<!-- Describe what this PR does and why. Reference any related issues (e.g. closes #N). -->
+
+## Type of change
+
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Refactor
+- [ ] Docs
+- [ ] Chore
+
+## Test checklist
+
+- [ ] `cargo test` passes
+- [ ] `cargo clippy --all-targets --all-features -- -D warnings` passes
+- [ ] New tests added (if applicable)
+
+---
+
+<!-- ferrish core principles: focused change, correctness over cleverness, clear description. -->

.github/copilot-instructions.md

@@ -18,16 +18,19 @@ These principles guide all development decisions:
 
 Modules use **file-based organization** (not mod.rs):
 
-- `src/lexer.rs` - Tokenization
-- `src/parser.rs` - AST construction
-- `src/evaluator.rs` - Execution
-- `src/repl.rs` - Interactive shell loop
-- `src/builtins.rs` - Built-in commands
-- `src/shell_io.rs` - I/O management
+- `src/shell.rs` — REPL loop; reads input, calls parser, calls executor, handles fatal vs. recoverable errors
+- `src/parser.rs` — Splits input into command + args; resolves whether the command is a built-in, a PATH executable, or unrecognized
+- `src/executor.rs` — Dispatches to built-in handlers or spawns external processes
+- `src/command/builtin.rs` — Implementations of `exit`, `cd`, `echo`, `pwd`, `type`
+- `src/command/executable.rs` — Wraps an external binary found on PATH
+- `src/io.rs` — `ShellIo` trait with `StandardIo` (real I/O) and `MockIo` (testing)
+- `src/ctx.rs` — Shell context and state
+- `src/error.rs` — `ShellError` enum; distinguishes fatal from recoverable errors
+- `src/arg.rs` — Argument parsing and representation
 
 ## Key Development Notes
 
-**Error Reporting**: Source span errors in lexer/parser are critical for user experience. Use **miette** to provide context and suggestions.
+**Error Reporting**: Use `thiserror` for structured project error types and `anyhow` for error propagation/context; keep user-facing messages clear and actionable.
 
 **Testing**: Shell-bound tests are essential. Beyond unit and integration tests, spawn ferrish as a subprocess to verify actual behavior (I/O, pipes, semantics, signal handling).