[guijacquemet]

Summary

registry.register() now converts --prefix, the interpreter path, every --pythonpath entry and --dir to absolute paths (os.path.abspath, deliberately not resolve(), because a venv's python is a symlink and the trust check compares paths without following links) before probing the interpreter, generating the schema and writing the entry. The registry JSON no longer depends on the caller's working directory. Absolute registrations and shared/system registries are unchanged; unregister --prefix already compares abspath of both sides, so equivalent paths still match.

How verified

• New tests/test_roundtrip_registration_paths.py: registers through the real command line from folder A with a relative --prefix and relative --pythonpath, asserts the stored JSON paths are absolute, then from an unrelated folder B runs list, doctor and run (the tool in A/src really runs), and finally unregister --prefix with the relative spelling.
• Sabotage check: with the registry.py change reverted the test fails (stored '../../usr' depends on the working directory).
• black, ruff, mypy, vulture all clean; full unit suite under coverage: all pass except test_hardening...test_foreign_owned_or_group_writable_shared_entry_is_skipped, which fails identically on unmodified origin/main in my root sandbox (the test is root-only and skips on CI); coverage 86.44% (floor 85).
• Ledger entry added in docs/REGRESSION_LEDGER.md (PR number follows in a second commit).

Fixes #49

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https://claude.ai/code/session_01Y2SN8SuEakTdiWy3F2WUqN

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