Improve combat log messages — too vague to follow gameplay

[eshaffer321]

Summary

Combat log messages in both the replay viewer and the live ActivityFeed are too vague to understand what's happening. Messages like "resolved a choice", "started Selection", and "played Rage (powered)" give no useful information about the actual game decisions.

Problem Statement

Two root causes:

1. Rust GameEvent lacks detail

• ChoiceResolved has choice_index (integer) but no description of what was chosen (e.g., "Gain 1 Red mana")
• CardPlayed doesn't include the effect value (e.g., Attack 4, Block 3)
• Many combat actions emit zero events and fall through to the generic ActionTaken fallback: DeclareBlock, EndCombatPhase, ResolveAttack, AssignDamageToHero, AssignDamageToUnit, BuySpell, LearnAdvancedAction, SelectReward

2. Narration layer can't show what it doesn't have

• narrateRustEvent.ts renders ChoiceResolved as "resolved a choice (Rage)" — useless
• Block declarations, damage assignments, and site interactions are invisible
• The older TS engine narration was richer in some areas (e.g., unit activation included ability used)

Current Behavior

— Ranged Siege Phase —
Krang played Concentration
Krang resolved a choice (Concentration)
Krang started Selection
— Block Phase —
Krang played Determination
Krang resolved a choice (Determination)
— Assign Damage Phase —
— Attack Phase —
Krang played Rage (powered)
Krang started Selection
Krang played Swiftness → Attack 1

Expected Behavior

— Ranged Siege Phase —
Krang played Concentration (basic) — gain 1 mana token
Krang chose: Gain 1 Red mana
Krang skipped Ranged/Siege
— Block Phase —
Krang played Determination (basic) — Block 3
Krang chose: 3 Physical Block
Krang played Ruthless Coercion → Block 3
Krang blocked Orc War Beasts (3 attack fully blocked)
— Assign Damage Phase —
No unblocked damage
— Attack Phase —
Krang played Rage (powered by Red) — Attack 4
Krang played Swiftness → Attack 1
Krang attacked Orc War Beasts: 5 attack vs 5 armor — DEFEATED (+3 fame)

Affected Files

Rust (event generation):

• engine-rs/crates/mk-types/src/events.rs — GameEvent enum needs richer variants
• engine-rs/crates/mk-engine/src/action_pipeline/mod.rs — event emission, delta detection, ActionTaken fallback

Client (narration):

• packages/shared/src/events/narrateRustEvent.ts — primary narration layer
• packages/shared/src/events/narrateEvent.ts — legacy TS narration (reference for richer messages)

Replay viewer:

• packages/python-sdk/src/mage_knight_sdk/viewer/ndjson_index.py — _summarize_events()
• packages/python-sdk/src/mage_knight_sdk/viewer/static/index.html — formatAction()

Acceptance Criteria

• ChoiceResolved events include a human-readable description of the chosen option
• CardPlayed events include the effect value (Attack N, Block N, Move N, Influence N)
• Combat-specific actions emit dedicated events instead of ActionTaken fallback (block declarations, damage assignments, attack resolution)
• EnemyDefeated includes fame gained
• Phase transitions with no actions show a summary (e.g., "No unblocked damage", "Skipped ranged phase")
• Powered card plays show the mana color used
• narrateRustEvent.ts updated to render all new event data
• Replay viewer updated to show richer messages