Per the issue spec for #2841 and CodeRabbit feedback on PR #2920, the project-context filename rewrite should produce HERMES.md, not .hermes.md. Reverts the earlier .hermes.md change at all 5 substitution sites in bin/install.js and updates the corresponding regression test in tests/hermes-install.test.cjs to assert HERMES.md. Full suite: 6127/6127 pass.