feat(directives): harvest 7 directives from python.md §17.1-17.7 (banned patterns + boundary exception)

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# boundary_layer_exception — v1
**Why this iteration:** Lifted verbatim from `conductor/code_styleguides/python.md` §17.7 (lines 352-354).
This 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:** `conductor/code_styleguides/python.md:352-354`
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### 17.7 The one exception: the boundary layer
The ONLY place these patterns are allowed is at the literal wire boundary — the function that calls `tomllib.load()`, `json.loads()`, or a vendor SDK's response parser. The boundary is 2-3 functions per file. Every consumer IMMEDIATELY converts to a typed dataclass via `from_dict()`.