Reframe Why VCALM as complementary to OID4, not a rival

[djscruggs]

What

Rewrites the Why VCALM page (and fixes overlapping copy on what-is-vcalm) to drop the combative "VCALM vs. OID4" framing in favor of a "yes, and…" positioning.

Why

Editorial feedback on the page flagged that it was both too combative and not quite accurate:

• "VCALM is an alternative to OID4VCI / OID4VP" is misleading — you can run OID4 over VCALM.
• "one exchange loop" is misleading and not the point.
• The "user vs. vendor" / them-vs-us framing forces a false choice.
• OID4 is really only about the delivery phase; a credential-lifecycle diagram would show what OID4 covers vs. what VCALM covers.
• Tone should highlight VCALM's strengths without turning the OID4 community away.

Changes

• New lede leads with the real thesis: VCALM resists vendor lock-in across every phase of the credential lifecycle, and it can carry OID4VCI / OID4VP — a "yes, and," not an "instead of."
• Added a lifecycle diagram: ISSUE → DELIVER → PRESENT → STATUS → REFRESH, showing OID4 covering the delivery hand-off and VCALM spanning all phases.
• Added a "Real protocol choice — OID4 included" section; reframed the other sections from combat into VCALM-positive (OID4 as a subset you keep, not a rival).
• Dropped the "one exchange loop" claim everywhere; changed "the user, or the vendor" → "you, or the vendor."
• Updated the at-a-glance table, FAQ, and structured data to match.
• Applied the same factual corrections to the overlapping copy + FAQ schema on what-is-vcalm.
• Retitled the page from "VCALM vs OID4VCI / OID4VP" to "Why VCALM — vendor-lock-free credentials (works with OID4, too)" to match the new framing.

Notes

• The page isn't linked from anywhere yet, so this is low-risk and easy to iterate on.
• A broader editorial pass on the use-case pages was flagged separately and is out of scope here — deferred pending more direction.

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[github-actions]

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Updated for commit 1d762f1.