feat(pmf): no-account value mode — quality/anti-slop for non-registered contributors

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Parent epic: PMF onboarding funnel (link below). Milestone M0.

Goal

Deliver clear, immediate value to a developer who is not registered on gittensor, so the first touch is useful without any account. This is the top of the onboarding funnel.

Context (what already exists)

• predict_gate works with no gittensor account (src/mcp/server.ts).
• The oss-anti-slop gate pack is repo-agnostic (not gittensor-coupled) — src/signals/focus-manifest.ts.
• Contributor tools (preflight, slop, issue-selection, PR-packet) exist but are framed gittensor-native (assume registration).

Requirements / Deliverables

• A coherent 'no-account mode' across CLI/MCP/extension: anti-slop self-check, 'what makes a real contribution', issue-fit, PR preflight — all functional without a gittensor login.
• Gate everything gittensor-native (reward/score/credibility) behind a clear 'register to unlock' boundary; never error for anon users.
• Copy/UX that makes the universal value obvious in <30s.

Outcome (measurable)

A non-registered user can run gittensory on a PR and get useful anti-slop + contribution guidance with zero setup → funnel step 1 (activation) is reachable without registration.

Depends on

oss-anti-slop pack, predict_gate.

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Closing as not planned (2026-07-01 issue audit): No-account value mode is top-of-funnel PMF conversion work retired by the self-hosted-only pivot.