fix: end invalid Dodge benefits permanently

[dajiaohuang]

Summary

• add a source-bound 2014 Dodge lifecycle contract based on encounter-owned effective speed and incapacitating conditions
• permanently clear the current Dodge benefit when speed reaches 0 or the actor becomes incapacitated, recording the reason so later restoration cannot reactivate it
• reconcile legacy encounter projections before and after condition/speed synchronization, so the first effect-removal write upgrades stale dodging=True snapshots without duplicate logs
• reuse the same active-state helper for normal/opportunity attack preflight and generic Dexterity saves
• register the mechanic only in the 2014 core rule pack and refresh the official-expansion lock from the checksum produced by the seeded core-content validation path

This PR intentionally makes no completeness claim for the 2024 Dodge lifecycle; 2024 Slow mastery effective-speed projection is tracked separately in #144.

Verification

• pytest packages/domain/tests -q
• pytest packages/mcp/tests/test_combat_transaction_boundaries_mcp.py -q
• pytest packages/mcp/tests/test_combat_transaction_boundaries_mcp.py -k "zero_speed_dodge or legacy_invalid_dodge" -q
• pytest packages/mcp/tests/test_official_expansions_mcp.py::test_official_expansion_lock_matches_seeded_core_content -q
• focused Dodge/core-boundary domain tests
• ruff check packages/domain packages/mcp
• git diff --check

The full MCP suite was sampled through more than 7% after the focused MCP file passed; the unchanged origin/main baseline was independently green at 1020 passed, 1 skipped.

Closes #134