docs: record product positioning evidence

[wlsdks]

Summary

• add docs/PRODUCT_POSITIONING_EVIDENCE_2026-07-06.md for PromptLane product positioning evidence
• teach quality-evidence to recognize product_positioning_metadata_alignment
• promote the product planning and positioning scorecard axis to 9.5/10 while keeping runtime IDs compatible
• package the new evidence document and guard the product-positioning evidence ref

Effect Check

• promptlane_95_quality remains pending, so this does not claim full 9.5 completion
• blockers drop from 5 to 4 by removing scorecard_axis:product_planning_and_positioning
• remaining blockers are Codex/Claude operator dogfood, web operations, scheduled ui-patrol, and native-dialog approved dogfood
• gh repo view wlsdks/promptlane --json name,description,url,homepageUrl,repositoryTopics confirms GitHub repo metadata matches PromptLane positioning

Verification

• corepack pnpm vitest run src/cli/commands/quality-evidence.test.ts src/packaging/quality-evidence-script.test.ts
• corepack pnpm vitest run src/cli/commands/quality-evidence.test.ts src/packaging/quality-evidence-script.test.ts src/packaging/plugin-files.test.ts --testNamePattern "quality|9.5"
• corepack pnpm --silent evidence:quality | node -e ...
• corepack pnpm test
• corepack pnpm lint
• corepack pnpm build
• node dist/cli/index.js quality-evidence | sed -n '1,90p'
• corepack pnpm pack:dry-run
• git diff --check