feat(skills): add brand-discovery and competitive benchmarking pipeline

Adds four community skills covering brand identity discovery and a
three-skill competitive benchmarking pipeline.

**brand-discovery** — Adaptive multi-session brand identity interview
spanning 8 modules (purpose, positioning, audience, personality, voice,
narrative, founder-brand tension, synthesis). Uses laddering, 5 Whys,
and projective techniques. State persisted to disk via state.json so
sessions resume across conversations without losing elicited knowledge.
Frameworks: Sinek, Dunford, Baker, Enns, Kapferer, Aaker, Neumeier,
Mark & Pearson, Lencioni. Includes 8 module output templates in
references/.

**competitive-platform-analysis** — Scopes and tiers a competitor set
before benchmarking begins. Categorizes candidates along 8 generic
creative-industry axes (positioning stance, specialization, size/model,
engagement format, distinctiveness posture, evidence model, brand
strength, market/reach) into Direct / Adjacent / Aspirational tiers.
Includes a pre-filter scoring matrix. First step in the pipeline.

**benchmark-methodology** — Scores each competitor across 9 weighted
dimensions (positioning 18%, brand voice 15%, visual craft 15%, offer
packaging 12%, evidence 12%, enterprise-readiness 10%, thought
leadership 8%, pricing 5%, client's strategic tension 5%) with explicit
1–5 rubrics and bias controls. Produces one profile card per competitor.

**competitive-report-structure** — Assembles scored cards into a
decision-grade report: executive summary, landscape map, competitor
tiers, heatmap matrix, deep dives, white-space and threats, strategic
recommendations, sources appendix.

brand-discovery complements brand-voice (ECC): brand-voice extracts a
style profile from existing source material; brand-discovery elicits
identity from scratch through structured interviews when no prior
material exists.

A competitive set scoped without the client's positioning brief is
noise, not intelligence — each skill enforces this by requiring the
brief before proceeding. The 9-dimension scoring framework deliberately
reports the client's strategic tension as two separate poles (never
averaged) because the gap between them is the strategic finding.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/zh-CN/README.md

@@ -83,7 +83,7 @@
 
 ### v2.0.0 — 智能体 Harness 操作系统（2026年6月）
 
-2.0 主线稳定版：261 个技能、control-pane 基底（会话适配器 + MCP 清单）、worktree 生命周期服务，以及 [ECC Discord 社区](https://discord.gg/36yGMHGFbR)。
+2.0 主线稳定版：265 个技能、control-pane 基底（会话适配器 + MCP 清单）、worktree 生命周期服务，以及 [ECC Discord 社区](https://discord.gg/36yGMHGFbR)。
 
 ### v2.0.0-rc.1 — 表面同步、运营工作流与 ECC 2.0 Alpha（2026年4月）
 
@@ -228,7 +228,7 @@ Copy-Item -Recurse rules/typescript "$HOME/.claude/rules/"
 /plugin list ecc@ecc
 ```
 
-**搞定！** 你现在可以使用 64 个智能体、262 项技能和 84 个命令了。
+**搞定！** 你现在可以使用 64 个智能体、269 项技能和 84 个命令了。
 
 ***
 
@@ -1142,7 +1142,7 @@ opencode
 |---------|---------------|----------|--------|
 | 智能体 | PASS: 64 个    | PASS: 12 个 | **Claude Code 领先** |
 | 命令 | PASS: 84 个    | PASS: 35 个 | **Claude Code 领先** |
-| 技能 | PASS: 262 项   | PASS: 37 项 | **Claude Code 领先** |
+| 技能 | PASS: 269 项   | PASS: 37 项 | **Claude Code 领先** |
 | 钩子 | PASS: 8 种事件类型 | PASS: 11 种事件 | **OpenCode 更多！** |
 | 规则 | PASS: 29 条    | PASS: 13 条指令 | **Claude Code 领先** |
 | MCP 服务器 | PASS: 14 个    | PASS: 完整 | **完全对等** |
@@ -1250,7 +1250,7 @@ ECC 是**第一个最大化利用每个主要 AI 编码工具的插件**。以
 |---------|-----------------------|------------|-----------|----------|
 | **智能体** | 64                    | 共享 (AGENTS.md) | 共享 (AGENTS.md) | 12 |
 | **命令** | 84                    | 共享 | 基于指令 | 35 |
-| **技能** | 262                   | 共享 | 10 (原生格式) | 37 |
+| **技能** | 269                   | 共享 | 10 (原生格式) | 37 |
 | **钩子事件** | 8 种类型                 | 15 种类型 | 暂无 | 11 种类型 |
 | **钩子脚本** | 20+ 个脚本               | 16 个脚本 (DRY 适配器) | N/A | 插件钩子 |
 | **规则** | 34 (通用 + 语言)          | 34 (YAML 前页) | 基于指令 | 13 条指令 |