chore: add opencode command stubs delegating to agent skills

Signed-off-by: Denis Ćorić <denis85@gmail.com>

Author: dcoric

.opencode/commands/address-review.md

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+---
+description: Address review comments on a GitHub PR
+---
+
+Follow @.agents/skills/address-review/SKILL.md.

.opencode/commands/commit.md

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+---
+description: Create a Conventional Commit with signoff
+---
+
+Follow @.agents/skills/commit/SKILL.md.

.opencode/commands/docs.md

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+---
+description: Update project docs per repo guidelines
+---
+
+Follow @.agents/skills/docs/SKILL.md.

.opencode/commands/implement.md

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+---
+description: Implement a change following repo workflow
+---
+
+Follow @.agents/skills/implement/SKILL.md.

.opencode/commands/issue.md

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+---
+description: Create a GitHub issue markdown file
+---
+
+Follow @.agents/skills/issue/SKILL.md.

.opencode/commands/lint.md

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+---
+description: Run repo format + lint workflow
+---
+
+Follow @.agents/skills/lint/SKILL.md.

.opencode/commands/summary.md

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+---
+description: Generate a concise PR implementation summary
+---
+
+Follow @.agents/skills/summary/SKILL.md.