feat(skills): add 5 skills from entireio/skills

skills/entire-explain/spec.yaml

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+# Entire explain Skill
+# Explain code intent by tracing it back to the original Entire session transcript.
+# Source: https://github.com/entireio/skills
+# Will publish as: ghcr.io/stacklok/dockyard/skills/entire-explain:0.1.0
+
+metadata:
+  name: entire-explain
+  description: "Explain the intent behind a function, file, or line by tracing it back to the original Entire session transcript that produced it."
+
+spec:
+  repository: "https://github.com/entireio/skills"
+  ref: "c376dc971045eb38c094802ca43875d1cfa00ea4"  # main as of 2026-05-07
+  path: "skills/explain"
+  version: "0.1.0"
+
+provenance:
+  repository_uri: "https://github.com/entireio/skills"
+  repository_ref: "refs/heads/main"
+
+security:
+  allowed_issues:
+    - rule_id: MANIFEST_MISSING_LICENSE
+      reason: "entireio/skills is MIT-licensed at the repo root; upstream does not embed an SPDX license identifier in per-skill SKILL.md frontmatter."

skills/entire-search/spec.yaml

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+# Entire search Skill
+# Find prior work, checkpoints, and agent conversations in Entire history before guessing from memory.
+# Source: https://github.com/entireio/skills
+# Will publish as: ghcr.io/stacklok/dockyard/skills/entire-search:0.1.0
+
+metadata:
+  name: entire-search
+  description: "Find prior work, checkpoints, or agent conversations in Entire history by topic, repo, branch, author, or recent time window. Use before guessing from memory."
+
+spec:
+  repository: "https://github.com/entireio/skills"
+  ref: "c376dc971045eb38c094802ca43875d1cfa00ea4"  # main as of 2026-05-07
+  path: "skills/search"
+  version: "0.1.0"
+
+provenance:
+  repository_uri: "https://github.com/entireio/skills"
+  repository_ref: "refs/heads/main"
+
+security:
+  allowed_issues:
+    - rule_id: MANIFEST_MISSING_LICENSE
+      reason: "entireio/skills is MIT-licensed at the repo root; upstream does not embed an SPDX license identifier in per-skill SKILL.md frontmatter."

skills/entire-session-handoff/spec.yaml

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+# Entire session-handoff Skill
+# Hand off the current or a saved Entire session to another agent with state, discoveries, and next steps.
+# Source: https://github.com/entireio/skills
+# Will publish as: ghcr.io/stacklok/dockyard/skills/entire-session-handoff:0.1.0
+
+metadata:
+  name: entire-session-handoff
+  description: "Hand off the current or a saved Entire session to another agent. Inspects recent sessions and produces a handoff summary covering state, discoveries, blockers, and next steps."
+
+spec:
+  repository: "https://github.com/entireio/skills"
+  ref: "c376dc971045eb38c094802ca43875d1cfa00ea4"  # main as of 2026-05-07
+  path: "skills/session-handoff"
+  version: "0.1.0"
+
+provenance:
+  repository_uri: "https://github.com/entireio/skills"
+  repository_ref: "refs/heads/main"
+
+security:
+  allowed_issues:
+    - rule_id: MANIFEST_MISSING_LICENSE
+      reason: "entireio/skills is MIT-licensed at the repo root; upstream does not embed an SPDX license identifier in per-skill SKILL.md frontmatter."

skills/entire-session-to-skill/spec.yaml

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+# Entire session-to-skill Skill
+# Turn Entire-tracked sessions, checkpoints, or repeated agent workflows into reusable SKILL.md drafts.
+# Source: https://github.com/entireio/skills
+# Will publish as: ghcr.io/stacklok/dockyard/skills/entire-session-to-skill:0.1.0
+
+metadata:
+  name: entire-session-to-skill
+  description: "Turn one or more Entire-tracked sessions, checkpoints, or repeated agent workflows into a reusable SKILL.md draft."
+
+spec:
+  repository: "https://github.com/entireio/skills"
+  ref: "c376dc971045eb38c094802ca43875d1cfa00ea4"  # main as of 2026-05-07
+  path: "skills/session-to-skill"
+  version: "0.1.0"
+
+provenance:
+  repository_uri: "https://github.com/entireio/skills"
+  repository_ref: "refs/heads/main"
+
+security:
+  allowed_issues:
+    - rule_id: MANIFEST_MISSING_LICENSE
+      reason: "entireio/skills is MIT-licensed at the repo root; upstream does not embed an SPDX license identifier in per-skill SKILL.md frontmatter."

skills/entire-what-happened/spec.yaml

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+# Entire what-happened Skill
+# Trace the latest change for a file range or pasted snippet via git blame plus Entire explain.
+# Source: https://github.com/entireio/skills
+# Will publish as: ghcr.io/stacklok/dockyard/skills/entire-what-happened:0.1.0
+
+metadata:
+  name: entire-what-happened
+  description: "Trace the latest change for a file range, line, or pasted snippet via `git blame` plus deduplicated `entire explain` lookups. Use when the user asks what happened, why a block was changed, or wants provenance for a specific section."
+
+spec:
+  repository: "https://github.com/entireio/skills"
+  ref: "c376dc971045eb38c094802ca43875d1cfa00ea4"  # main as of 2026-05-07
+  path: "skills/what-happened"
+  version: "0.1.0"
+
+provenance:
+  repository_uri: "https://github.com/entireio/skills"
+  repository_ref: "refs/heads/main"
+
+security:
+  allowed_issues:
+    - rule_id: MANIFEST_MISSING_LICENSE
+      reason: "entireio/skills is MIT-licensed at the repo root; upstream does not embed an SPDX license identifier in per-skill SKILL.md frontmatter."