docs(humanizer): v5.1.0 release notes across plugin + marketplace docs

- Plugin README: add "What's New in v5.1.0" section with humanizer overview,
  before/after example, plain-language vocabulary table, --raw flag docs.
  Bump version badge 5.0.0 → 5.1.0. Add Version History row.
- Plugin CLAUDE.md: add humanizer.mjs + humanizer-data.mjs to Scanner Lib
  table. Add "Plain-Language Output (v5.1.0)" section documenting output
  modes, vocabularies, and Wave 5 lessons. Bump test count 635 → 792 across
  52 test files.
- Marketplace root README: bump config-audit entry 5.0.0 → 5.1.0, update
  one-line description to mention plain-language UX, add bullet for the
  v5.1.0 humanizer, bump test count 635+ → 792+.

Test-normalizer hardening (consequence of growing CLAUDE.md):
walkClaudeMdCascade walks upward from the marketplace-medium fixture into
this plugin's own CLAUDE.md, so any docs edit ripples into
`scanners[*].activeConfig.claudeMdEstimatedTokens`. The v5.0.0 byte-stability
contract is about scanner internals being unchanged, not ancestor input
content being frozen. Normalizers in json-backcompat, raw-backcompat,
posture-humanizer, scan-orchestrator-humanizer, and snapshot-default-output
now strip claudeMdEstimatedTokens to <ANCESTOR_DERIVED>. The
default-output snapshot for scan-orchestrator was re-seeded via
UPDATE_SNAPSHOT=1 (intent: Wave 6 docs additions; humanizer prose
unchanged).

Verify:
- grep -E "5\.1\.0|v5\.1\.0" README.md CLAUDE.md ../../README.md | wc -l = 12
- node --test 'tests/**/*.test.mjs' = 792/792 pass
- self-audit configGrade A (97), pluginGrade A (100), readmeCheck.passed true

README.md

@@ -51,9 +51,9 @@ Key commands: `/security posture`, `/security audit`, `/security scan`, `/securi
 
 ---
 
-### [Config-Audit](plugins/config-audit/) `v5.0.0`
+### [Config-Audit](plugins/config-audit/) `v5.1.0`
 
-Configuration intelligence for Claude Code — health checks, feature discovery, auto-fix, active-config inventory, and reality-based Opus-4.7 token analysis.
+Configuration intelligence for Claude Code — health checks, feature discovery, auto-fix, active-config inventory, reality-based Opus-4.7 token analysis, and plain-language UX that leads with prose ("Fix soon: The same automation is set up more than once") instead of technical IDs.
 
 Claude Code reads instructions from 7+ file types across multiple scopes. This plugin tells you what's wrong, what's missing, what's silently conflicting, what's actually loaded, and where you're burning tokens unnecessarily:
 
@@ -63,10 +63,11 @@ Claude Code reads instructions from 7+ file types across multiple scopes. This p
 - **What's active** — read-only inventory of plugins, skills, MCP servers, hooks, and CLAUDE.md cascade for a repo, with token estimates
 - **Token hotspots** — `/config-audit tokens` ranks files by estimated waste across 6 Opus-4.7 patterns (cache-breaking volatile content, redundant tool permissions, deep import chains, oversized cascades, bloated SKILL.md descriptions, MCP tool-schema budget). Optional `--accurate-tokens` calibrates against Anthropic's `count_tokens` API.
 - **System-prompt manifest** — `/config-audit manifest` ranks every token source (CLAUDE.md cascade, plugins, skills, MCP servers, hooks) by estimated tokens
+- **Plain-language UX (v5.1.0)** — default output of all 18 commands leads with prose; findings group by user-impact category (Configuration mistake, Conflict, Wasted tokens, Missed opportunity, Dead config) and urgency phrase (Fix this now → FYI). Pass `--raw` for v5.0.0 verbatim output; `--json` is unchanged and byte-stable.
 
 Key commands: `/config-audit posture`, `/config-audit feature-gap`, `/config-audit fix`, `/config-audit whats-active`, `/config-audit tokens`, `/config-audit manifest`
 
-6 agents · 12 scanners · 18 commands · 635+ tests
+6 agents · 12 scanners · 18 commands · 792+ tests
 
 → [Full documentation](plugins/config-audit/README.md)