⚡ Bolt: Files.exists() I/O 낭비 및 TOCTOU 방지

[seonghobae]

Superseded by #222.

[google-labs-jules]

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[Copilot]

Pull request overview

Removes pre-read Files.exists() checks in disk-backed artifact and ledger readers, handling “file missing” cases by catching NoSuchFileException to avoid extra stat I/O and reduce TOCTOU windows.

Changes:

• FileSystemArtifactStore#getPdf now treats missing files as cache misses by catching NoSuchFileException.
• ArtifactLinkLedger#load and KpiSnapshotLedger#load now attempt Files.lines(...) directly and return on NoSuchFileException.
• Adds a Bolt note documenting the “single I/O then catch NoSuchFileException” pattern.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/main/java/com/clearfolio/viewer/artifact/FileSystemArtifactStore.java	Removes Files.exists pre-check and handles missing file via NoSuchFileException.
src/main/java/com/clearfolio/viewer/artifact/ArtifactLinkLedger.java	Removes Files.exists pre-check and handles missing ledger via NoSuchFileException.
src/main/java/com/clearfolio/viewer/analytics/KpiSnapshotLedger.java	Removes Files.exists pre-check and handles missing ledger via NoSuchFileException.
.jules/bolt.md	Documents the optimization/TOCTOU-avoidance pattern.
src/main/java/com/clearfolio/viewer/artifact/FileSystemArtifactStore.java.orig	New backup-like copy of pre-change source (should be removed).
src/main/java/com/clearfolio/viewer/artifact/ArtifactLinkLedger.java.orig	New backup-like copy of pre-change source (should be removed).
src/main/java/com/clearfolio/viewer/analytics/KpiSnapshotLedger.java.orig	New backup-like copy of pre-change source (should be removed).

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