fix(build): tidy obsolete module checksums

[dnlrsls]

🔗 Linked Issue

Closes #1699

🏷️ PR Type

• type:bug — Bug fix
• type:feature — New feature
• type:question — Question requiring tracked work
• type:docs — Documentation only
• type:refactor — Code refactoring
• type:chore — Maintenance
• type:breaking-change — Breaking change

📝 Summary

• Remove fourteen obsolete checksum rows with the release's Go 1.25.10 toolchain.
• Restore go mod tidy -diff without changing go.mod, resolved dependency versions, runtime code, or the release guard.
• Prepare the approved v3.2.1 recovery; preserve the already-published v3.2.0 tag and Cloud images.

📂 Changes

File	Change
go.sum	Remove obsolete checksum and /go.mod pairs for seven older golang.org/x module versions

🧪 Test Plan

• Regression oracle: Go 1.25.10 go mod tidy -diff — RED exit1 before tidy, GREEN exit0/no diff afterward.
• go list -m all before/after — identical module graph; git diff -- go.mod empty.
• go mod verify — all modules verified.
• git diff --check — pass; candidate is one file, 0 additions/14 deletions.
• CGO_ENABLED=0 go build -o .release-tools/engram.exe -ldflags='-X main.version=3.2.1' ./cmd/engram with Go 1.25.10 — pass.
• Independent verification — actual failed release logs match the removed rows; independent Go1.25.10 tidy check passes.
• Native review review-bf1e5cf27864f6e6 approved and acknowledged for exact tree 04375400d24f8eecb6175dc1b8d0661a65849c5f.
• Runtime unit tests: no new behavior/test introduced; broad unit/E2E/plugin/lint/platform suites run in GitHub CI, not duplicated locally for checksum cleanup.

🤖 Automated Checks

Required issue-reference, approved-issue, type-label, Unit Tests, E2E Tests, and Plugin Tests: pending until GitHub runs them. Applicable lint, Windows, and transient-artifact checks are also pending.

✅ Contributor Checklist

• Linked approved issue fix(build): tidy module checksums to unblock core release #1699.
• Exactly one type:* label.
• Recorded actual regression and applicable local checks; candidate CI remains pending.
• Documentation/help: N/A — no user-facing behavior, command, option, or message changed.
• Conventional commit; no Co-Authored-By trailers.
• Only go.sum enters this PR; cache, binary, local ODD tracking, and unrelated changes excluded.

💬 Notes for Reviewers

Release failure: https://github.com/Gentleman-Programming/engram/actions/runs/37561305090
Cloud v3.2.0 publication succeeded separately; this PR does not re-tag, bypass guards, publish npm, or merge automatically. A new v3.2.1 tag is planned only after explicit merge approval and successful merged-candidate checks.

Native acknowledgement succeeded; its optional candidate-view cleanup was deferred with candidate-view-git-failure. No out-of-band cleanup or new review was attempted.

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[barbatdev]

Fleet review (qwen)

Closes #1699. Fix: tidy obsolete module checksums. go.sum contained 14 obsolete golang.org/x checksums blocking v3.2.0 release workflow. Removed obsolete entries only. go mod tidy -diff passes. 0 new behavior/test.

Suggestion (1)

• Tidy obsolete module checksums (fix(build): tidy module checksums to unblock core release #1699) (go.sum:119): Closes fix(build): tidy module checksums to unblock core release #1699. Removed 14 obsolete golang.org/x checksums. go mod tidy -diff passes. Release blocker.

Verdict: clean