docs: update DEVLOG for S12.18 close-out

[DavidCozens]

Purpose

One-off recovery — the DEVLOG entry for S12.18 (#319) should have ridden in that PR but was missed. Captures the design decisions and deferrals from the error-reporting API slice for posterity.

Going forward the DEVLOG commit lives on the work branch alongside the feature commits and goes through the same PR (per SKILL.md cadence and the S08.03 slice 10 precedent in #316). I've saved that as a hard-rule reminder so it doesn't recur.

Change Description

Append-only DEVLOG entry covering:

• Two-effects-one-dispatch design decision (over installable second handler).
• Default handler nil-object choice.
• Origin parameter deferred to S12.19 as YAGNI.
• Atomicity not protected — documented as setup-time invariant.
• Examples-install-handlers-by-default decision (control-products framing).
• Test-side / production-side message DRY via SolidSyslogErrorMessages.h.
• CHECK_* macro extraction and TEST_GROUP-member sentinel refactor.
• Local pre-PR check coverage including bonus FreeRTOS cross-compile.

Plus deferred-work pointers (S12.19, rate limiter, NULL-guard sweep, CALLED_FUNCTION macro pattern).

Test Evidence

DEVLOG-only change. No code touched, no tests affected.

Areas Affected

• DEVLOG.md — single appended section dated 2026-05-10, placed at the top above the existing S08.03 slice 8 entry.

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 7d309f15-4973-4804-b722-6b26772cd539

📥 Commits

Reviewing files that changed from the base of the PR and between 0da65dc and adf3523.

📒 Files selected for processing (1)

• DEVLOG.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/s12-18-devlog

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[github-actions]

☀️   Quality Summary

   🚦   build-linux-gcc: 100% successful (✔️ 1109 passed, 🙈 3 skipped)
   🚦   build-linux-clang: 100% successful (✔️ 1046 passed, 🙈 3 skipped)
   🚦   sanitize-linux-gcc: 100% successful (✔️ 1046 passed, 🙈 3 skipped)
   🚦   integration-linux-openssl: 100% successful (✔️ 9 passed)
   🚦   integration-windows-openssl: 100% successful (✔️ 9 passed)
   🚦   bdd-linux-syslog-ng: 94% successful (✔️ 46 passed, 🙈 3 skipped)
   🚦   bdd-windows-otel: 90% successful (✔️ 44 passed, 🙈 5 skipped)
   🚦   bdd-freertos-qemu: 49% successful (✔️ 24 passed, 🙈 25 skipped)
   🚦   build-windows-msvc: 100% successful (✔️ 958 passed, 🙈 1 skipped)
   ⚠️   Clang-Tidy: No warnings
   ⚠️   CPPCheck: No warnings

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Created by Quality Monitor v1.14.0 (#f3859fd). More details are shown in the GitHub Checks Result.