[cschanhniem]

Implements J6 from NEXT_100_PR_MAP: public license and reuse guide.

What

• docs/LICENSE_AND_REUSE_GUIDE.md: 8 sections
• Apache 2.0 summary: what you may do, must do, must not do
• Artifact-specific constraints: CERT-, FAE-, BMC-, schema files
• dry_lab_only preservation requirement: cannot strip disclaimers
• proof_ladder_level immutability: cannot modify without new CERT-
• Trademark non-claim: derivative projects may not use 'OpenAMP Foundry' to imply official status
• Patent termination clause summary
• Contribution licensing: PRs offered under Apache 2.0
• Docs-only PR; no code changes

Why

Without a reuse guide, partner labs either over-cautiously avoid reusing any output, or incorrectly redistribute artifacts without the dry-lab-only disclaimer. The guide clarifies that reuse is wide-open under Apache 2.0 while making it explicit that the dry_lab_only assertion cannot be stripped.

Disconfirming pass

• Guide does not grant permission to remove dry_lab_only flags
• Does not imply biological activity anywhere
• proof_ladder_level immutability rule prevents silent claim escalation during redistribution