fix(parser): route bare "you don't own" ownership suffix (Agent of Treachery)

[galuis116]

Summary

Fixes #3304.

Agent of Treachery — "At the beginning of your end step, if you control three or more permanents you don't own, draw three cards." — drew three cards every end step, because the intervening-if condition was silently dropped (the trigger parsed with condition: null).

Root cause

parse_ownership_or_controller_suffix only recognized the "but don't own" family (which additionally requires a controller already set). The bare "you don't own" suffix had no arm, so parse_type_phrase("permanents you don't own") left "you don't own" unconsumed → parse_control_count_ge returned a non-empty remainder → try_extract_intervening's boundary check failed → the entire condition was discarded.

Fix (parser-only; no new engine variant)

Add a bare "you don't own" / "you do not own" arm to parse_ownership_or_controller_suffix that pushes the existing FilterProp::Owned { controller: Opponent } — runtime-evaluated as owner != controller, i.e. "you don't own it". The arm deliberately does not set the controller (ownership is independent of control, CR 109.4); for "you control N permanents you don't own" the controller is supplied upstream by inject_controller_you, composing to Typed(Permanent, controller: You, [Owned{Opponent}, InZone Battlefield]) = "permanents you control but don't own".

The end-step trigger now carries QuantityComparison(ObjectCount{…} >= 3) and is gated at detection and resolution per CR 603.4 — so it draws only when the controller controls ≥3 permanents they don't own. The "but don't own" path (Thieving Amalgam family) is a separate code path and is untouched.

Runtime

• Control ≥3 not-owned (e.g. stolen) permanents at your end step → trigger fires, draw 3.
• Control <3 → condition false → no draw.

The fix consumes only previously-orphaned text; it also lets Sentinel of Lost Lore / similar "card you don't own …" object phrases consume the suffix (strictly additive — the parallel "you own" arm already exists).

Tests

• agent_of_treachery_end_step_draw_is_gated_by_not_owned_count — the end-step trigger's condition is Some(QuantityComparison{ GE, Fixed 3, ObjectCount{ filter } }) (not None), with the filter Typed(Permanent, controller: You) carrying FilterProp::Owned{ Opponent }; the execute body still draws; no parse warnings.
• parse_control_count_ge_permanents_you_dont_own — combinator unit (both "don't"/"do not"), empty remainder, Owned{Opponent} + controller: You.
• parse_type_phrase_but_dont_own_shape_unchanged_by_bare_arm — no-regression: "creature you control but don't own" still yields the unchanged And[Typed(You), Not(Owned{You})] shape (proves the bare arm is additive).

(Reverting the new arm makes the first two tests fail with the exact dropped-condition signature; the no-regression test still passes.)

Verification

• cargo +nightly test -p engine --lib "own": 297 passed; "dont_own": 8 passed; --test integration: 1065 passed (no fixture diff).
• cargo +nightly clippy -p engine --lib -- -D warnings: clean. rustfmt --check: clean. Parser-combinator gate: clean (the new arm uses only tag/alt).

CR references grep-verified against docs/MagicCompRules.txt: 108.3 (owner), 109.4 (control ≠ ownership), 603.4 (intervening-if).

[gemini-code-assist]

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