docs(641): Add specification files for sample markdown document feature

specs/641-sample-markdown-document-e6124f/feature.yaml

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+feature:
+  id: "641-sample-markdown-document-e6124f"
+  name: "sample-markdown-document-e6124f"
+  number: 641
+  branch: "feat/641-sample-markdown-document-e6124f"
+  lifecycle: "research"
+  createdAt: "2026-04-17T16:20:36Z"
+status:
+  phase: "research"
+  progress:
+    completed: 0
+    total: 0
+    percentage: 0
+  currentTask: null
+  lastUpdated: "2026-04-17T16:20:36Z"
+  lastUpdatedBy: "feature-agent"
+  completedPhases:
+    - "fast-implement"
+validation:
+  lastRun: null
+  gatesPassed: []
+  autoFixesApplied: []
+tasks:
+  current: null
+  blocked: []
+  failed: []
+checkpoints:
+  - phase: "feature-created"
+    completedAt: "2026-04-17T16:20:36Z"
+    completedBy: "feature-agent"
+errors:
+  current: null
+  history: []

specs/641-sample-markdown-document-e6124f/spec.yaml

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+# Feature Specification (YAML)
+# This is the source of truth. Markdown is auto-generated from this file.
+
+name: sample-markdown-document-e6124f
+number: 641
+branch: feat/641-sample-markdown-document-e6124f
+oneLiner: create a single markdown file called test-ljoefh.md with a title and 2-3 sentences about anything
+userQuery: >
+  create a single markdown file called test-ljoefh.md with a title and 2-3 sentences about anything
+summary: >
+  create a single markdown file called test-ljoefh.md with a title and 2-3 sentences about anything
+phase: Analysis
+sizeEstimate: M
+
+# Relationships
+relatedFeatures:
+  []
+
+technologies:
+  []
+
+relatedLinks:
+  []
+
+# Open questions (must be resolved before implementation)
+openQuestions:
+  []
+
+# Markdown content (the actual spec)
+content: |
+  ## Problem Statement
+
+  create a single markdown file called test-ljoefh.md with a title and 2-3 sentences about anything
+
+  ## Success Criteria
+
+  - [ ] TBD
+
+  ## Affected Areas
+
+  | Area | Impact | Reasoning |
+  | ---- | ------ | --------- |
+  | TBD  | TBD    | TBD       |
+
+  ## Dependencies
+
+  None identified.
+
+  ## Size Estimate
+
+  **M** - To be refined during research
+
+  ---
+
+  _Generated by feature agent — proceed with research_

test-ljoefh.md

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+# The Wonders of Stargazing
+
+Stargazing is one of humanity's oldest pastimes, offering a direct connection to the cosmos and our place within it. Looking up at the night sky allows us to contemplate the vast distances between celestial objects and appreciate the intricate beauty of the universe. Whether you're observing with the naked eye or through a telescope, the experience of watching stars brings a sense of wonder and perspective that few other activities can match.