Function syncPdfFtsIndex

syncPdfFtsIndex(vault: Vault, idx: FtsIndex): Promise<PdfFtsSyncReport>
Synchronize PDF chunks into an opened FTS5 index.

The complete bounded PDF inventory is diffed against retained PDF source state. Each changed source is extracted and admitted independently; failed or partial page evidence quarantines that source while preserving its prior coherent generation. A complete textless PDF authoritatively clears stale rows. The optional PDF module is resolved before any destructive diff work.
Parameters
- vault: Vault
  Vault whose complete admitted PDF inventory is synchronized.
- idx: FtsIndex
  Open FTS index receiving committed PDF generations.
Returns Promise<PdfFtsSyncReport>
Counters for actual commits, authoritative textless skips, and failures.
Throws
When the bounded source inventory is incomplete, the optional extraction module cannot load, or deletion itself fails.
Example
```
const report = await syncPdfFtsIndex(vault, index);
if (!report.complete) process.stderr.write(`PDF failures: ${report.failed}\n`);
```
- Defined in src/fts5.ts:3189