fix(db): add missing plugin_meta table

[JacobRWebb]

Summary

• Fixed session start crash caused by missing plugin_meta table
• session-start.ts was attempting to INSERT into a table that didn't exist in the schema
• Added the table to both schema.ts (fresh installs) and as a v6 migration (existing databases)

[greptile-apps]

Greptile Summary

This PR fixes a critical session start crash by adding the missing plugin_meta table to the database schema. The table was being referenced in session-start.ts:163-171 but wasn't defined in the schema, causing INSERT failures on session initialization.

• Added plugin_meta table definition to schema.ts for fresh database installations
• Created v6 migration in migrate.ts to add the table for existing databases
• Updated version detection logic to properly identify v6 databases
• Documented the fix in CHANGELOG for v2.1.4 release

The fix follows existing database patterns and properly handles both upgrade paths (fresh install vs migration).

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• The fix correctly addresses a critical bug by adding the missing table to both the base schema and migration path. The implementation is clean, follows existing patterns, and has no edge cases or logical errors.
• No files require special attention

Important Files Changed

Filename	Overview
src/db/schema.ts	Added plugin_meta table definition with proper constraints and indexes
src/db/migrate.ts	Bumped schema to v6, added migration and version detection for plugin_meta table
CHANGELOG.md	Documented v2.1.4 release with database schema fix details

Sequence Diagram

sequenceDiagram
    participant Session as session-start.ts
    participant Migrate as migrate.ts
    participant DB as SQLite Database
    
    Session->>Migrate: runMigrations()
    Migrate->>DB: getCurrentVersion()
    
    alt Fresh Database (v0)
        DB-->>Migrate: version = 0
        Migrate->>DB: Execute SCHEMA_SQL (includes plugin_meta)
        Migrate->>DB: INSERT schema_version = 6
    else Existing Database (v5)
        DB-->>Migrate: version = 5
        Migrate->>DB: Execute migration v6 (CREATE plugin_meta)
        Migrate->>DB: INSERT schema_version = 6
    else Already Updated (v6)
        DB-->>Migrate: version = 6
        Note over Migrate: No migrations needed
    end
    
    Migrate-->>Session: Migration complete
    Session->>DB: INSERT plugin_meta (install_source)
    Session->>DB: INSERT plugin_meta (version)
    DB-->>Session: Success (table now exists)

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[greptile-apps]

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