코어: preflight 스냅샷과 UTF-8 휴리스틱 통합

[HuitaePark]

변경 내용

• PR #57의 preflight 비용 상한 계산과 PR #58의 UTF-8 byte 휴리스틱 estimator를 main 기준으로 통합했습니다.
• 비용 계산기가 mutable registry를 다시 조회하지 않고, 문맥에 담긴 불변 PricingSnapshot을 사용하도록 수정했습니다.
• 계산 결과 Bounded에도 실제 사용한 PricingSnapshot을 보존해 예약·정산 계층에 전달할 수 있게 했습니다.
• 계산 불가능한 극단적 BigDecimal 정밀도는 typed unavailable 결과로 반환합니다.
• AGENTS.md와 Javadoc에 UTF-8 휴리스틱의 TEXT_ONLY/BPE 안전성 가정을 명시했습니다.

검증

• ./gradlew --no-daemon test
• ./gradlew --no-daemon check
• ./gradlew --no-daemon :token-pilot-core:javadoc

Refs #31
Refs #45

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Review details

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 1365dff0-95cf-435b-930f-eff930e25dad

📥 Commits

Reviewing files that changed from the base of the PR and between 908fc44 and 5e055e3.

📒 Files selected for processing (11)

• AGENTS.md
• build.gradle
• token-pilot-core/src/main/java/io/tokenpilot/core/PreflightCostEstimator.java
• token-pilot-core/src/main/java/io/tokenpilot/core/domain/PreflightCostResult.java
• token-pilot-core/src/main/java/io/tokenpilot/core/domain/PreflightCostUnavailableReason.java
• token-pilot-core/src/main/java/io/tokenpilot/core/domain/PreflightPricingContext.java
• token-pilot-core/src/main/java/io/tokenpilot/core/internal/DefaultPreflightCostEstimator.java
• token-pilot-core/src/main/java/io/tokenpilot/core/internal/HeuristicTokenEstimator.java
• token-pilot-core/src/main/java/io/tokenpilot/core/internal/LedgerComponents.java
• token-pilot-core/src/test/java/io/tokenpilot/core/internal/DefaultPreflightCostEstimatorTest.java
• token-pilot-core/src/test/java/io/tokenpilot/core/internal/HeuristicTokenEstimatorTest.java

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