feat(directives): harvest 3 directives from tier3-worker.md §17.9 (import/aliasing/from_dict bans)

conductor/directives/ban_local_imports/v1.md

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+# ban_local_imports — v1
+
+**Why this iteration:** Lifted verbatim from `.opencode/commands/mma-tier3-worker.md:42-46` (the current canonical source). The plan referenced `conductor/code_styleguides/python.md` §17.9a (lines 364-443) but that section no longer exists in python.md after a 2026-06-27 refactor — the §17.9 content was moved into the agent role prompts (this file). This v1 is the baseline encoding — the imperative-ban style currently in production.
+Future variants will test alternative encodings (rationale-first, before/after, tabular) against this baseline.
+
+**Source:** `.opencode/commands/mma-tier3-worker.md:42-46` (originally `conductor/code_styleguides/python.md` §17.9a, drift-corrected)
+
+---
+
+- Local imports inside functions (top-of-module imports only)
+
+**The one exception:** the literal wire boundary (TOML/JSON parse functions) may use `dict[str, Any]` + `Metadata.from_dict(...)`.

conductor/directives/ban_prefix_aliasing/v1.md

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+# ban_prefix_aliasing — v1
+
+**Why this iteration:** Lifted verbatim from `.opencode/commands/mma-tier3-worker.md:43` (the current canonical source). The plan referenced `conductor/code_styleguides/python.md` §17.9b (lines 364-443) but that section no longer exists in python.md after a 2026-06-27 refactor — the §17.9 content was moved into the agent role prompts (this file). This v1 is the baseline encoding — the imperative-ban style currently in production.
+Future variants will test alternative encodings (rationale-first, before/after, tabular) against this baseline.
+
+**Source:** `.opencode/commands/mma-tier3-worker.md:43` (originally `conductor/code_styleguides/python.md` §17.9b, drift-corrected)
+
+---
+
+- `import X as _PREFIX` aliasing (use the original name)

conductor/directives/ban_repeated_from_dict/v1.md

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+# ban_repeated_from_dict — v1
+
+**Why this iteration:** Lifted verbatim from `.opencode/commands/mma-tier3-worker.md:44` (the current canonical source). The plan referenced `conductor/code_styleguides/python.md` §17.9c (lines 364-443) but that section no longer exists in python.md after a 2026-06-27 refactor — the §17.9 content was moved into the agent role prompts (this file). This v1 is the baseline encoding — the imperative-ban style currently in production.
+Future variants will test alternative encodings (rationale-first, before/after, tabular) against this baseline.
+
+**Source:** `.opencode/commands/mma-tier3-worker.md:44` (originally `conductor/code_styleguides/python.md` §17.9c, drift-corrected)
+
+---
+
+- Repeated `.from_dict()` calls in the same expression (cache the result or promote the type)