feat: add plan and review workflow skills

.config/opencode/skills/requesting-code-review/SKILL.md

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+---
+name: requesting-code-review
+description: Request a reviewer pass after each task or feature and before merge to catch issues early
+permalink: opencode-config/skills/requesting-code-review/skill
+---
+
+# Requesting Code Review
+
+Request a `reviewer` agent pass before changes move forward or merge.
+
+## Core Workflow
+
+Request review:
+- After a completed task in a multi-task implementation
+- After finishing a feature slice
+- Before opening or merging a PR
+
+Include all required context in the request:
+- What was implemented
+- Requirements or plan source (for example, `plans/<note-name>` in basic-memory)
+- Brief summary of behavior and design choices
+- Actual diff context (commit range and/or key changed files)
+
+## How to Run It
+
+1. Gather concrete diff context for the exact review scope:
+
+```bash
+BASE_SHA=$(git merge-base HEAD origin/$(git rev-parse --abbrev-ref @{upstream} | cut -d/ -f2 2>/dev/null || echo main))
+HEAD_SHA=$(git rev-parse HEAD)
+
+git diff --stat "$BASE_SHA..$HEAD_SHA"
+git diff "$BASE_SHA..$HEAD_SHA"
+```
+
+2. Dispatch `reviewer` with a focused request using:
+- exact implemented scope
+- the relevant `plans/` note or requirement text
+- a concise summary
+- the concrete diff range (`BASE_SHA..HEAD_SHA`) and any key files
+
+Use `reviewer.md` as a request template.
+
+3. Triage feedback before continuing:
+- Fix critical issues immediately
+- Address important issues before merge
+- Track minor issues intentionally
+- If feedback appears incorrect, reply with code/test evidence and request clarification
+
+## Red Flags
+
+Never:
+- Skip review because a change seems small
+- Continue with unresolved critical issues
+- Request review without plan/requirement context
+- Request review without concrete diff scope
+
+## Related Skills
+
+- `verification-before-completion`
+- `git-workflow`

.config/opencode/skills/requesting-code-review/reviewer.md

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+---
+title: reviewer-request-template
+type: note
+permalink: opencode-config/skills/requesting-code-review/reviewer-template
+---
+
+# Reviewer Request Template
+
+Use this when dispatching the `reviewer` agent.
+
+## What Was Implemented
+
+<what-was-implemented>
+
+## Requirements / Plan
+
+- Plan note: `plans/<note-name>`
+- Requirements summary:
+  - <requirement-1>
+  - <requirement-2>
+
+## Summary
+
+<brief summary of behavior/design choices>
+
+## Diff Context
+
+- Base: <base-sha>
+- Head: <head-sha>
+- Range: `<base-sha>..<head-sha>`
+- Key files:
+  - <path-1>
+  - <path-2>
+
+```bash
+git diff --stat <base-sha>..<head-sha>
+git diff <base-sha>..<head-sha>
+```
+
+## Reviewer Output Requested
+
+1. Strengths
+2. Issues by severity:
+   - Critical (must fix)
+   - Important (should fix before merge)
+   - Minor (nice to have)
+3. Merge readiness verdict with short reasoning
+
+For each issue include file:line, why it matters, and suggested fix.