chore(docs): fill acceptance criteria

Author: piotrzajac

.backlog/completed/task-5 - Add-SECURITY.md.md

@@ -21,7 +21,7 @@ Create a SECURITY.md file at the repository root that documents the vulnerabilit
 
 ## Acceptance Criteria
 <!-- AC:BEGIN -->
-- [ ] #1 SECURITY.md exists at the repository root
-- [ ] #2 Covers: how to report a vulnerability privately, expected response timeline, supported versions
-- [ ] #3 GitHub 'Report a vulnerability' link is active (enabled in repo Security settings)
+- [x] #1 SECURITY.md exists at the repository root
+- [x] #2 Covers: how to report a vulnerability privately, expected response timeline, supported versions
+- [x] #3 GitHub 'Report a vulnerability' link is active (enabled in repo Security settings)
 <!-- AC:END -->

.backlog/completed/task-6 - Add-CODE_OF_CONDUCT.md.md

@@ -15,12 +15,12 @@ priority: low
 ## Description
 
 <!-- SECTION:DESCRIPTION:BEGIN -->
-Add a CODE_OF_CONDUCT.md to the repository root. The Contributor Covenant (https://www.contributor-covenant.org/) is the standard for OSS projects and is widely recognised. GitHub surfaces this file in the community health checklist.
+Add a CODE_OF_CONDUCT.md to the repository root. The [Contributor Covenant](https://www.contributor-covenant.org/) is the standard for OSS projects and is widely recognised. GitHub surfaces this file in the community health checklist.
 <!-- SECTION:DESCRIPTION:END -->
 
 ## Acceptance Criteria
 <!-- AC:BEGIN -->
-- [ ] #1 CODE_OF_CONDUCT.md exists at the repository root
-- [ ] #2 Based on a recognised standard (e.g. Contributor Covenant v2.1)
-- [ ] #3 Contact address for enforcement is set to an appropriate maintainer email
+- [x] #1 CODE_OF_CONDUCT.md exists at the repository root
+- [x] #2 Based on a recognised standard (Contributor Covenant v2.1)
+- [x] #3 Enforcement contact set to maintainer GitHub profile (@piotrzajac) — no email per project policy
 <!-- AC:END -->

.backlog/completed/task-7 - Add-CODEOWNERS-file.md

@@ -20,7 +20,7 @@ Create a .github/CODEOWNERS file that maps paths to GitHub teams or users who ar
 
 ## Acceptance Criteria
 <!-- AC:BEGIN -->
-- [ ] #1 .github/CODEOWNERS exists and is syntactically valid
-- [ ] #2 A default owner (* pattern) is defined
-- [ ] #3 Reviewers are automatically requested on PRs touching covered paths
+- [x] #1 .github/CODEOWNERS exists and is syntactically valid
+- [x] #2 A default owner (* pattern) is defined
+- [x] #3 Reviewers are automatically requested on PRs touching covered paths
 <!-- AC:END -->