refactor: replace SQLite with recoverable JSON storage

[AntonyGarand]

Why

The Plugin Hub standard build cannot bundle the SQLite driver. SQLite was never released, so existing users need a safe migration from legacy JSON only. The current JSON path also leaves saves optional and rewrites entire account files, with weak protection against interrupted writes and competing clients.

Summary

• Remove SQLite, backend switching and the driver. Use RuneLite-provided Gson and Java 11 for one versioned JSON store: a checkpoint, its previous copy and a JSON Lines transaction journal.
• Migrate legacy accounts and account-wide settings once, preserving source files. Retain all trades, recipe snapshots, favorites, slot state, large prices and timestamp precision.
• Save pending changes every second on an ordered I/O worker. Append changed records, acknowledge forced writes, retry failures and drain pending changes at shutdown. The sidebar shows Saved, Saving… or Needs attention.
• Coordinate clients with file locking and account baseline checks. Preserve conflicting local captures for recovery and prevent stale reloads from overwriting local edits.
• Move startup parsing/I/O off the client thread, avoid history traversal for session ticks, and sort account-wide merged histories once per item.
• Include build=standard and the CI work from build: add standard Plugin Hub packaging and CI feedback #103: Java 11 tests plus the official RuneLite packager, with job summaries and downloadable logs/packages.

Storage format, recovery procedure and the seven-issue mapping.

Validation

• ./gradlew clean build --no-daemon --console=plain, then ./gradlew build --no-daemon --console=plain after review fixes, on Java 11: final suite passed all 186 tests with no failures or skips.
• Compiled production sources and packaged the JAR using the pinned Plugin Hub standard build template and RuneLite 1.13.0.
• Synthetic 50,000-trade / 200-recipe history reloads in full; adding a trade appends under 2 KiB. Tests also cover migration parity, corrupt checkpoints/journals, interrupted initialization, concurrent clients, dirty retries, deletion, shutdown and stale refreshes.
• GitHub Actions: Java 11 build/tests and official RuneLite Plugin Hub packaging both passed on 048ef77. Logs, test reports and the packaged plugin are available in the run artifacts.
• Independent review passed after fixing active-account deletion, view-reset and batch-deletion selection regressions.

Notes

All history remains in memory as requested; there is no 100-trade limit, pagination or disk query index. Hydration and full-account change capture still involve client-thread work. Same-account conflicts are reported and preserved for manual reconciliation rather than automatically merged. Uncommitted/queued changes remain vulnerable to abrupt termination; directory-sync guarantees depend on the filesystem.

This draft includes #103 and leaves that PR open. No SQLite import is included because SQLite was never shipped. Legacy files stop updating after migration; older plugin versions will not see new trades. Tests use synthetic data, not player files. In-client manual validation remains for maintainer review.

_{🤖 cb-ship:created v1 skill@1.0.13}

Agent session: codex resume 01a0e966-8bd5-75a2-a5e4-879d7b59a625 · Model: gpt-6-astra · Reasoning: ultra

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