docs: record PR 55 merge

[StreamDemon]

Summary

• mark the full M.D.C. combat exchange design complete after PR feat: complete mega-damage combat exchange #55 merged
• record the maintainer merge timestamp, merge commit, and automatic closure of Issue Full M.D.C. combat: tier interaction, armor ablation, and unprotected outcomes #51

Why

The committed design still reported that PR #55 was awaiting the human merge even though the maintainer had already merged it. This aligns the durable design record with the repository and tracker state.

Impact

Documentation only; runtime behavior and rules content are unchanged.

Validation

• vp check: 130/130 files formatted; 95/95 lint/typecheck files clean
• vp test: 23/23 files; 540/540 tests passed
• git diff --check: clean

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Summary by cubic

Updated the M.D.C. combat exchange design doc to mark the work complete after PR #55 merged, and recorded the maintainer merge time and automatic closure of Issue #51. Documentation only; runtime and rules content remain unchanged.

^{Written for commit 3ce1008. Summary will update on new commits.}

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 30c0e2b6-9067-443c-970d-98c0b55d17be

📥 Commits

Reviewing files that changed from the base of the PR and between 77bcd8a and 3ce1008.

📒 Files selected for processing (1)

• .codex/superpowers/specs/2026-07-21-mdc-combat-exchange-design.md

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📝 Walkthrough

Walkthrough

The design document now marks PR #55 as merged and Issue #51 as closed on 2026-07-22, and records the maintainer merge timestamp and commit hash.

Changes

Combat exchange documentation

Layer / File(s)	Summary
Merge completion record .codex/superpowers/specs/2026-07-21-mdc-combat-exchange-design.md	Updates the document status and adds the human maintainer’s PR #55 merge details, including the timestamp and commit hash.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the documentation update recording PR 55's merge.
Description check	✅ Passed	The description clearly matches the documentation-only merge-record update described in the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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_{Comment @coderabbitai help to get the list of available commands.}