Add current-direction route locks

[8Dionysus]

Summary

• add a small regression lock for the repo's current-direction surface
• keep root README.md and AGENTS.md routed to the repo's canonical ROADMAP.md or equivalent current entry surface

Testing

• run the repo-native targeted test for tests/test_current_direction_routes.py

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Verify actual links instead of token presence

Using assertIn("ROADMAP.md", ...) only checks for a raw substring, so this test will still pass if README.md or AGENTS.md merely mention ROADMAP.md in unrelated text while the real entrypoint links are removed or redirected. Because this test is intended as a route lock, it should assert an actual Markdown link/route target (or equivalent structured marker) to prevent false negatives in future regressions.

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