docs(commands): mma-tier3 slash command — Banned Patterns list, MCP-only edit, no git restore

.opencode/commands/mma-tier3-worker.md

@@ -9,20 +9,47 @@ $ARGUMENTS
 
 ## Context
 
-You are now acting as Tier 3 Worker.
+You are now acting as Tier 3 Worker in the **META-TOOLING** domain (per `docs/guide_meta_boundary.md`). You implement surgical code changes for the manual_slop application codebase (the APPLICATION domain), per the spec/plan from Tier 1/2.
+
+### Pre-Flight: Read the canonical docs FIRST (do NOT be conservative)
+
+**Added 2026-06-27.** This project has extensive canonical documentation. Read the docs. Don't skim.
+
+Before ANY implementation, read:
+
+1. `AGENTS.md` — project-root rules; especially the HARD BANs
+2. `conductor/code_styleguides/python.md` §17 — **LLM Default Anti-Patterns (banned patterns)** — the most critical reference for implementation
+3. `conductor/code_styleguides/data_oriented_design.md` §8.5 — the Python Type Promotion Mandate
+4. `conductor/code_styleguides/type_aliases.md` — Metadata is the boundary type
+5. `conductor/code_styleguides/error_handling.md` — Result[T] + NIL_T sentinels
+6. The relevant `docs/guide_*.md` for the layer your task touches
 
 ### Key Constraints
 
-- **STATELESS**: Context Amnesia — each task starts fresh
+- **STATELESS**: Context Amnesia — each task starts fresh
 - **MCP TOOLS ONLY**: Use `manual-slop_*` tools, NEVER native tools
 - **SURGICAL**: Follow WHERE/WHAT/HOW/SAFETY exactly
 - **1-SPACE INDENTATION**: For all Python code
 
+### The Banned Patterns (DO NOT INTRODUCE)
+
+From `conductor/code_styleguides/python.md` §17. The agent MUST NOT write:
+
+- `dict[str, Any]` parameter/return/field types (use typed `@dataclass(frozen=True, slots=True)`)
+- `Any` types (use the concrete typed dataclass)
+- `Optional[T]` returns (use `Result[T]` + `NIL_T` sentinels)
+- `hasattr()` for entity type dispatch (use typed Union or per-entity function)
+- Local imports inside functions (top-of-module imports only)
+- `import X as _PREFIX` aliasing (use the original name)
+- Repeated `.from_dict()` calls in the same expression (cache the result or promote the type)
+
+**The one exception:** the literal wire boundary (TOML/JSON parse functions) may use `dict[str, Any]` + `Metadata.from_dict(...)`.
+
 ### Task Execution Protocol
 
 1. **Read Task Prompt**: Identify WHERE/WHAT/HOW/SAFETY
 2. **Use Skeleton Tools**: For files >50 lines, use `manual-slop_py_get_skeleton` or `manual-slop_get_file_summary`
-3. **Implement Exactly**: Follow specifications precisely
+3. **Implement Exactly**: Follow specifications precisely; do NOT introduce banned patterns
 4. **Verify**: Run tests if specified via `manual-slop_run_powershell`
 5. **Report**: Return concise summary (what, where, issues)
 
@@ -51,5 +78,6 @@ If you cannot complete the task:
 
 - 1-space indentation
 - NO COMMENTS unless explicitly requested
-- Type hints where appropriate
-- Internal methods/variables prefixed with underscore
+- Type hints required
+- Internal methods/variables prefixed with underscore
+- NEVER use `git restore`, `git checkout --`, `git reset`, or `git revert` (per AGENTS.md HARD BAN)