Concepts: promotion — from a record to a chip

[saucissefarciehumaine-prog]

One page, one subject, branched from current main (01fea74) — not stacked on anything.

The question this answers. "I have a chipless spool in my inventory — what do I get when I write it to a chip?" Seven places in the wiki say a record is promotable to a real chip — glossary.md, guides/start-for-free.md, philosophy/second-life.md, products/tiger-studio.md, products/tigerpod.md, guides/README.md — and every one of them points at concepts/universal-filament-identity.md, which names promotion in a single clause and never says what comes out. This adds the answer to the page they all point at, as a section, not a new page — the home you suggested in #20.

The core is the line you confirmed. A promoted TigerData+ becomes a TigerTag+ — still identified, still not signed, as a two-row table (what you promote → what you get → why), then the two consequences: promotion never produces a Certified, and it is reversible because chips are never write-locked.

Dropped from #20. Link to twin Spool (no home in the repo) and the desktop-only / Connect cannot write a record claim (no pointable source). The page says only what is documented: Tiger Studio promotes in one step, atomically.

Dropped since #28 landed. The section originally closed on "with a TigerPOD, both chips are written in one pass". That fact now has a clear owner — guides/twin-tag-pair.md, plus products/tigerpod.md and guides/start-for-free.md — and pairing is not promotion, so the sentence is gone rather than restated.

One thing to confirm. The state diagram had TigerData+ --"write to a chip"--> TigerTag, which contradicts the bullet directly below it: "Write a catalogue product into that chip rather than hand-typed values and it is a TigerTag+". A TigerData+ carries a catalogue product by definition, so the edge has to land on TigerTag+. Moved in both languages — fenced code must stay identical for check:i18n. If the edge was intentional, say so and I'll revert that hunk; the section stands without it.

Not touched: the promote a chipless spool TODO in guides/README.md. That list is about guides, and whether a concept section retires a planned guide is your call, not mine.

Two files, both locales. Existing page, no new route, no sidebar entry. i18n/fr mirror updated with its sourceHash refreshed. pnpm check:docs, check:i18n and build all green locally (121 pages, all internal links valid).

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