chore: simplify, modernize (Go 1.26), update deps

[rustatian]

Applied fixes

R (review/correctness) — 7 applied:

• keys==nil → len(keys)==0 in Has, MGet, Set, Delete (catches empty-slice callers)
• time.Parse/client.Set errors in Set wrapped with errors.E(op, err)
• Clear return value wrapped with errors.E(op, err) + op name added
• Has/Delete: validate keyTrimmed and operate on keyTrimmed (was validating trimmed but passing untrimmed key to memcache)
• Duplicate/misleading ErrCacheMiss comment in Delete removed

S (simplify) — 6 applied:

• Dead if exist != nil guard removed in Has (unreachable after err != nil branch)
• MGet: merged validate loop and fetch loop into single pass
• Delete: collapsed two-pass validate+delete loops into one
• Flags: 0 zero-value field omitted from memcache.Item literal
• Inaccurate // unsafe convert comment removed from Value: field
• if s.Addr == nil → len(s.Addr) == 0 in config.go InitDefaults

M (modernize Go 1.26) — 4 applied:

• All for i := range keys { keys[i] } → for _, key := range keys (Go 1.22 range-over-value)
• MGet: replaced N×Get loop with single GetMulti(keys) call (otelmemcache exposes it cleanly)
• Inline one-use keyTrimmed variable in Get
• Rename stderr "errors" alias: stdlib errors used directly, RR errors package aliased as rrerrors

Not applied (needs manual review)

• plugin.go:50 — p.tracer always set → nil-guard in driver unreachable: the nil-guard in NewMemcachedDriver is a defensive pattern worth keeping; it's not a correctness issue.

Verification

go build ./...   ✓
go vet ./...     ✓
golangci-lint run → 0 issues ✓

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 949e9e8c-92d8-4851-b2b4-41b7402cd3bb

📥 Commits

Reviewing files that changed from the base of the PR and between 7040e08 and d71a6de.

📒 Files selected for processing (2)

• memcachedkv/config.go
• memcachedkv/driver.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/cleanup-modernize-deps

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[Copilot]

Pull request overview

Simplifies and modernizes the memcached KV driver: aliases the RoadRunner errors package as rrerrors so the stdlib errors can be used directly for errors.Is, switches variadic-empty checks to len(...) == 0, collapses duplicate validate/fetch loops, uses GetMulti in MGet, ensures Has/Delete operate on the trimmed key, and wraps previously bare returns in Set/Clear with the op-tagged error.

Changes:

• Rename errors import to rrerrors and use stdlib errors.Is for memcache.ErrCacheMiss checks.
• Tighten/simplify Has, MGet, Set, Delete, Clear: nil→len checks, single-pass loops, GetMulti, consistent rrerrors.E(op, err) wrapping, range-over-value loops.
• Config.InitDefaults now defaults when Addr is nil or empty (len(s.Addr) == 0).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
memcachedkv/driver.go	Errors-package alias, simplified loops/checks, GetMulti, consistent error wrapping, trimmed-key usage in Has/Delete.
memcachedkv/config.go	Default-address check now covers empty slices as well as nil.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.00%. Comparing base (7040e08) to head (d71a6de).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #124   +/-   ##
=======================================
  Coverage   65.00%   65.00%           
=======================================
  Files           1        1           
  Lines          20       20           
=======================================
  Hits           13       13           
  Misses          4        4           
  Partials        3        3           

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