Proof-of-Work portfolio pages (public, auto-generated)

Why / Context

PRD §7.2B: the auto-generated Proof-of-Work profile is "the thing a self-paced Udemy certificate cannot offer" — a public, shareable portfolio built automatically from completed, mentor-reviewed projects and endorsements. It's the natural artifact to share with recruiters/LinkedIn and the substrate for the hiring-partner talent marketplace (V2). Confirmed whitespace in teardown §5.3: neither Crio nor Euron productizes this.

Schema already in place — NO migration required

• PortfolioProfile (slug, headline, about, visibility PUBLIC/UNLISTED/PRIVATE, talentOptIn, featured Json)
• ProjectInstance(status: PASSED) + ProjectReview scores + MentorEndorsement (text, skills, visible)
• Credential with public verification codes (verify page shipped at MVP M11)
• Plan entitlement portfolioTier: BASIC|VERIFIED (Mentor/Career get VERIFIED)

Implementation plan

1. Public route /(marketing)/p/[slug] (ISR): hero (headline/about/links), verified credentials strip, project showcase cards (title, tier badge, tech stack, mentor endorsement quotes, final score band), completed-course section.
2. Auto-population service (src/lib/career/portfolio.ts): on ProjectInstance → PASSED or Credential issuance, append to the profile's default showcase; learner curates via featured Json (pin/hide/reorder).
3. Profile editor in the learner dashboard: slug claim, headline/about (Tiptap), links, visibility control, talent-pool opt-in toggle (consent copy per DPDP).
4. Endorsement flow: after final review, prompt mentor for a 2–3 sentence endorsement + skill tags (MentorEndorsement); learner can hide but not edit.
5. OG image generation (satori) per profile for rich LinkedIn/X shares; share CTA post-completion ("Add to LinkedIn" deep link with certificate URL).
6. VERIFIED tier treatment: verification badge + mentor-review provenance panel (review dates, mentor level) for Mentor/Career subscribers.
7. SEO: sitemap inclusion for PUBLIC profiles, noindex for UNLISTED.
8. Privacy: PRIVATE default; anonymization job (issue #24) must blank profiles — add to that issue's checklist.

Acceptance criteria

• Passing a project adds it to the learner's portfolio automatically; learner can feature/hide items
• Public profile renders without auth, with working credential verification links
• Mentor endorsements appear with attribution and skills
• OG card renders correctly in LinkedIn/X preview debuggers
• Visibility controls enforced (UNLISTED not in sitemap; PRIVATE 404s for others)

Dependencies / sequencing

• MVP M10 + M11 required
• Prerequisite for issue #18 (talent marketplace searches over opted-in portfolios)

Start with the existing PortfolioProfile, ProjectInstance, ProjectReview, MentorEndorsement, and Credential schema, then inspect src/lib/career/portfolio.ts and the public route /(marketing)/p/[slug]. Review the learner dashboard entry point and MVP M10/M11 dependencies before planning the editor, endorsement, SEO, and OG-image work. Done means the acceptance criteria pass, including visibility enforcement and adding the anonymization checklist to issue #24.