feat(skills): add shared task workflows

shared/skills/research/repository-research/SKILL.md

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+---
+name: repository-research
+description: Investigate an existing repository to find relevant code and established patterns.
+---
+
+# Repository Research
+
+Use before changing an unfamiliar repository area.
+
+Inspect relevant files, callers, tests, configuration, and established patterns.
+
+Return evidence, affected areas, unknowns, and useful implementation context. Avoid modifying implementation code.

shared/skills/research/technical-research/SKILL.md

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+---
+name: technical-research
+description: Investigate technical options and relevant evidence before implementation.
+---
+
+# Technical Research
+
+Use when an implementation depends on unfamiliar technology, APIs, tools, or trade-offs.
+
+Gather relevant evidence, compare viable options, and identify unknowns.
+
+Return concise findings with sources, assumptions, and a recommendation when appropriate. Do not implement the change.