chore: add shared skills catalog (19 skills), installers, manifest, validator

skills/research-add-fields/LICENSE

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+MIT License
+
+Copyright (c) 2026 Lan Zheng
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

skills/research-add-fields/SKILL.md

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+---
+name: research-add-fields
+description: Add field definitions to existing research outline.
+user-invocable: true
+---
+
+# Research Add Fields - Supplement Research Fields
+
+## Trigger
+`/research-add-fields`
+
+## Workflow
+
+### Step 1: Auto-locate Fields File
+Find `*/fields.yaml` file in current working directory, auto-read existing fields definitions.
+
+### Step 2: Get Supplement Source
+Ask user to choose:
+- **A. User direct input**: User provides field names and descriptions
+- **B. Web Search**: Launch a web-search subagent via the `subagent` tool to search common fields in this domain (methodology: `.agents/skills/research/agents/web-search-agent.md`)
+
+### Step 3: Display and Confirm
+- Display suggested new fields list
+- User confirms which fields to add
+- User specifies field category and detail_level
+
+### Step 4: Save Update
+Append confirmed fields to fields.yaml, save file.
+
+## Output
+Updated `{topic}/fields.yaml` file (in-place modification, requires user confirmation)