[repeat98]

• What was wrong or hard: VECTOR stored a settings byte of 0x80 or more in the Part. Stock's Part check refuses it and drops the whole bank at power-on, before the module is back ([vector] Losing Samples and Sequences #1533, fix in VECTOR 0.3.2: saved projects survive a power cycle #1537). No guide said so.
• What this changes: one paragraph in the persistence section of docs/ADD_A_MODULE.md.
• How I checked it: read the page; it stays under the 40 KB limit. npm run pr:ready not run for this one-paragraph edit; CI runs the docs checks.
• What the guides lacked or got wrong, and where I fixed it: this is that fix.

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