refactor(operation): carve _recipe_expansion/ + _pseudoaxis/ subpackages from the BC root

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Summary

The Operation BC root had drifted to 12 private _*.py modules, past the ~10-file "revisit" threshold in docs/reference/layout.md — the 2nd BC to cross it (the equipment _bodies/ + _pidinst/ carve is the n=1 precedent). This is a pure, behavior-preserving file reorganization that groups two cohesive clusters into private subpackages whose __init__ re-exports the public surface, so consumers import from the package.

• _recipe_expansion/ ← _expand.py (was _recipe_expansion.py), _replay.py (was _recipe_replay.py), _resolved_steps_replay.py — the recipe step-resolution + replay/verify cluster.
• _pseudoaxis/ ← _evaluator.py (was _pseudoaxis_evaluator.py), _expander.py (was _pseudoaxis_expander.py) — the virtual-axis resolution cluster.

Root drops from 12 → 7 private modules + 2 subpackages.

Why it's behavior-preserving

• The moved modules' content is byte-identical except one intra-cluster import line each (rewritten to the sibling submodule) — confirmed by git rename detection (R100/R098/R099).
• All consumer import sites updated to the package path; the lazy/canonical_json_bytes/steps_to_wire imports still resolve through the package __init__ re-exports.
• A path-coupled arch test (test_recipe_step_variants_match_step_union) is retargeted to the _expand submodule where the private _expand_step dispatch helper now lives.
• Submodules drop the redundant package prefix (_pseudoaxis/_evaluator, not _pseudoaxis/_pseudoaxis_evaluator), matching the locked _pidinst/ precedent.

Verification

Operation unit tests (881) + full architecture tier (26,916) + full unit tier (10,466) + pyright + tach + ruff all green. Gate-reviewed (behavior-preservation + import-graph completeness + naming-r3): ship, no P0/P1 — runtime import check of all 14 re-exported names + the private helper + all consumer modules resolved OK; no import cycle; no surviving bare-module import paths. Two cosmetic stale-docstring references were also fixed.

This resolves the second of the two fired rule-of-three triggers from the agent-fleet review (the first — the _flag_watcher scaffold — shipped in #308).

🤖 Generated with Claude Code

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Coverage report

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File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
apps/api/src/cora/api
_calibration_watcher.py
_clearance_watcher.py
_procedure_watcher.py
apps/api/src/cora/operation
_conduct_preparation.py
apps/api/src/cora/operation/_pseudoaxis
__init__.py
_expander.py
apps/api/src/cora/operation/_recipe_expansion
__init__.py
_replay.py
apps/api/src/cora/operation/adapters
in_memory_recipe_expander.py
apps/api/src/cora/operation/features/reconduct_procedure
handler.py
Project Total

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