[ISSUE-03] Implement BuildOptions option groups

[Gonza10V]

Motivation

• Provide a focused, safe configuration/contract layer for the full_build clean-architecture refactor so later planner, executor, stage, inventory, adapter, and reporting components can consume typed option groups.
• Keep defaults conservative and compiler-only, avoid pulling optional automation dependencies, and ensure mutable defaults are isolated across instances.

Description

• Added src/buildcompiler/api/options.py implementing ProtocolMode and composed option dataclasses: CombinatorialOptions, Lvl2SearchOptions, PlanningOptions, ExecutionOptions, SelectionOptions, ProtocolOptions, ReportingOptions, ApprovalOptions, ReagentOptions, DomesticationOptions, and BuildOptions, using field(default_factory=...) for nested/mutable defaults.
• Updated src/buildcompiler/api/__init__.py to export BuildOptions, the focused option-group dataclasses, and ProtocolMode for lightweight imports.
• Added unit tests tests/unit/api/test_options.py that validate required defaults and mutable-default isolation across BuildOptions instances.
• Reused existing domain approval enum (ApprovalStatus) in domain contracts and avoided importing or requiring optional automation packages in core option modules.

Testing

• Ran import smoke checks with PYTHONPATH=src python -c "from buildcompiler.api.options import BuildOptions; BuildOptions()" and PYTHONPATH=src python -c "from buildcompiler.api import BuildOptions; BuildOptions()", both of which succeeded.
• Ran unit tests with PYTHONPATH=src pytest tests/unit/api/test_options.py, which passed (2 passed), and broader package tests with PYTHONPATH=src pytest tests/unit/domain tests/unit/api, which also passed (5 passed).
• Attempting uv run pytest tests/unit/api/test_options.py failed here due to environment resolution of an optional SBOLInventory dependency (git fetch returned HTTP 403), so uv-based verification could not complete in this environment.
• Ran lint/format checks ruff check . and ruff format --check . which reported pre-existing repository issues unrelated to these changes (these lint/format failures are outside the scope of this PR).

Closes #55

Codex Task