Bind repository presentation slots to Hygiene

[szmyty]

Summary

• map Holon's repository-presentation slot aliases to the canonical Hygiene slot identifiers
• keep the source-facing blueprint slot API unchanged
• validate complete, unique bindings and cover the generated markers across every built-in profile
• document the binding contract

Why

Pace #14's Mantle canary exposed a contract seam: Holon rendered markers such as banner and navigation, while Egolint validates Hygiene's canonical identifiers such as identity_banner and canonical_navigation. This fixes that integration blocker at the owning layer without changing policy semantics.

Validation

• python3 tools/repository_presentation_blueprint.py validate-fixtures
• python3 -m unittest tests.test_repository_presentation_blueprint --verbose
• Python bytecode compilation
• git diff --check

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