feat(directives): add 15 engagement-specific directives + tags.toml entries

conductor/directives/scripts_namespace_isolated/v1.md

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+# Scripts are namespace-isolated by directory — no `from scripts.foo import bar` across script dirs
+
+## What it says
+
+Script directories (`scripts/`, `scripts/tier2/`, `scripts/audit/`, `scripts/tier2/artifacts/`) are namespace-isolated. A script in one directory MUST NOT import from a script in another directory. Scripts are not a package; they are standalone tools.
+
+## Why
+
+Scripts are throw-away or single-purpose tools. If `scripts/audit_weak_types.py` imports from `scripts/tier2/failcount.py`, then `audit_weak_types.py` depends on the tier2 sandbox's internal state. The dependency makes the audit script fragile (it breaks if tier2 moves) and the tier2 scripts less isolated (they are now part of a graph, not standalone).
+
+## The pattern
+
+```python
+# WRONG: cross-directory import
+from scripts.tier2.failcount import should_give_up
+
+# RIGHT: copy the needed function into the script, or factor it into src/
+```
+
+## See also
+
+- `conductor/directives/file_naming_convention` — the file naming rules
+- `conductor/directives/large_files_are_fine` — large files are fine; do not split for modularity