fix/urzas saga phase two nested quote

[colin-riddell]

Summary

Fix Urza's Saga chapter II creating a 0/0 Construct that immediately died to SBAs. Two cooperating bugs:

Parser (parser/oracle_effect/token.rs): extract_token_static_abilities only matched double-quoted spans. Chapter II's Oracle text nests the create-token
clause inside a double-quoted activated ability (This Saga gains "...with 'This token gets +1/+1...'"), so the inner ability uses single quotes — silently dropped,
leaving the Token effect's static_abilities field empty.

Added a structurally-anchored single-quote pass: open ' must follow with /and /or /, , close ' is the last ' in the text. That pairing rule keeps
internal apostrophes (can't, creature's) safe as content, never delimiter. Generalises to the whole class of nested grant-create-token-with-ability cards.

Engine (game/effects/token.rs): apply_create_token_after_replacement only wrote the spec's static abilities to live static_definitions, not
base_static_definitions. The layers reset at layers.rs:519 (obj.static_definitions = Arc::clone(&obj.base_static_definitions)) wiped the boost on every pass
before layer 7c could read it. The 0/0 Construct then died to CR 704.5f.

Mirrored the spec's static abilities onto base_static_definitions so the layers reset preserves them — same pattern already used for Role token statics at
token.rs:1326.

Test plan

• Parser unit tests: extract_static_single_quoted_ability_with_apostrophe_content, extract_static_single_quoted_boost_by_count
• Engine unit test: apply_create_token_mirrors_static_abilities_to_base
• End-to-end integration test: chapter_two_construct_survives_sba_via_self_count_boost — activates the granted {2}, {T} ability, resolves it, asserts the
  Construct enters the battlefield as a 1/1 (counting itself) and survives SBAs
• cargo test -p engine (6016 tests pass), cargo clippy -p engine --all-targets -- -D warnings, cargo fmt --all -- --check
• Manual: load Urza's Saga, advance to chapter II, pay {2}{T}, confirm Construct token appears on the battlefield