[guijacquemet]

What

Roadmap 18 phase 0.2, in separate commits (each with its own tests):

1. Version 0.2.0rc1 from one source (labconstrictor_tools/_version.py; pyproject reads it dynamically). OPERATIONS.md: tag names (vX.Y.Z, vX.Y.Z-rc.N), who tags (the maintainer; no tags or releases created here), procedure.
2. Reserved underscore inputs (_job_dir, _calibration, _axes, any _name) are accepted and ignored by the worker. List is protocol.RESERVED_INPUTS, documented in PROTOCOL.md. convert.undeclared_inputs is the single check that issue Reject undeclared worker inputs instead of silently using defaults #51 must use; load_inputs consults it. A tool cannot declare a reserved name. Reject undeclared worker inputs instead of silently using defaults #51 is NOT implemented here.
3. tools_version and features in the schema and in the registry entry; describe prints them, doctor shows them (missing = unknown/old). Additive within protocol 1. Feature ids: only reserved_inputs_v1 today. calibration_per_axis and retention_prune are documented as planned and must be added by the PR that implements them.
4. labconstrictor_tools.compat.check_schema(schema, min_tools_version, required_features, warn_below_tools_version=None) returns ok/warn/refuse with a one-sentence reason. Rules are in PROTOCOL.md; vectors are in the compat section of the proposed conformance.json in HOST_PARITY.md.
5. CI job compat: installs the newest v* tag (no tag: prints why and passes) and runs tests/compat_matrix.py (old/new schema read both ways, old/new worker requests). Frozen fixtures: tests/fixtures/schemas/tools_0.1 and tools_0.2, pinned by hash.
6. OPERATIONS.md: how installers pin LC_TOOLS_SPEC to a tag, and the list of app files to change.
   Ledger rows added.

How verified

• New tests: test_versions, test_reserved_inputs, test_tools_features, test_compat, test_compat_matrix. Each was sabotage-checked (breaking the production code fails them).
• compat_matrix.py run against a real venv built from the previous main (Tools 0.1.0): all 11 checks pass.
• black, ruff, mypy, vulture clean. Full suite with coverage: 86.94% (floor 85).
• Locally 2 failures, neither from this change. test_hardening...foreign_owned_or_group_writable_shared_entry_is_skipped fails the same way on origin/main when run as root. test_sabotage hit a full disk in the sandbox and passed on rerun.
• origin/main (including Registration: store absolute prefix, interpreter and pythonpath paths #102) merged before opening.

Open points

• The maintainer must create the tag v0.2.0-rc.1 after merge.
• App installer edits are documented only (later task).

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