fix(skills): 去除束缚 Agent 自主判断的机械数字策略 (#58)

## 摘要 / Summary

### 中文

去除技能里束缚执行 Agent 自主判断的**机械数字策略**：create 需求收集的「每轮最多问 2 个」、discover
排序的「最多展示 5 个候选」。改为交由 Agent 按情况自主把握追问节奏与展示数量，保留「别让用户负担 /
别一次刷屏」的原则意图——把控制权交还给判断力更强的执行者，而非用固定上限约束。create 2.5.3 / discover
2.6.3，manifest 1.2.14，中英双份同步、重算 source_hash（validate-i18n 通过）。

### English

Remove mechanical numeric limits that constrain the executing Agent's
judgment: create's "at most 2 questions per turn" and discover's "show
at most 5 candidates". Both become "the Agent decides the pacing/count
by situation", keeping the principle intent (don't burden the user /
don't flood the screen) while handing control back to the more capable
executor instead of a fixed cap. create 2.5.3 / discover 2.6.3, manifest
1.2.14, both locales synced, hashes recomputed (validate-i18n passes).

skills/discover-agent/SKILL.md

@@ -1,7 +1,7 @@
 ---
 name: discover-agent
 description: 根据用户需求推荐最匹配的智能体，展示候选列表并引导选择。Use when 用户描述需求但不确定该找哪个智能体帮忙，或想浏览可用的智能体。
-version: 2.6.2
+version: 2.6.3
 type: procedural
 risk_level: low
 status: enabled
@@ -24,7 +24,7 @@ metadata:
       short_desc: 根据需求描述智能推荐最匹配的智能体，引导快速选择
       description: 根据用户需求推荐最匹配的智能体，展示候选列表并引导选择。Use when 用户描述需求但不确定该找哪个智能体帮忙，或想浏览可用的智能体。
       body: ./SKILL.zh-CN.md
-      source_hash: sha256:0a1c7b0b1b60e399
+      source_hash: sha256:72159b331107dfb6
       translated_by: human
     en-US:
       name: Discover Agent
@@ -32,7 +32,7 @@ metadata:
       description: >-
         Recommend the best-matching Agent based on the user’s needs, show a candidate list, and guide selection. Use when the user describes a need but is unsure which Agent to ask for help, or wants to browse available Agents.
       body: ./SKILL.md
-      source_hash: sha256:0a1c7b0b1b60e399
+      source_hash: sha256:72159b331107dfb6
       translated_by: ai:claude-fable-5
       translated_at: '2026-07-19'
 market:
@@ -84,7 +84,7 @@ Judge match with LLM semantic understanding (not a formula): relevance of descri
 
 ### Stage 4: Ranking
 
-Descending by overall score; ties broken by online status; show at most 5 candidates.
+Descending by overall score; ties broken by online status; show the most relevant few — you decide how many by relevance, avoiding flooding the screen.
 
 ### Stage 5: Presentation