feat(sdd,agents): SDD-003 spec-gate + AI-019 model-tier policy#60
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Bundle of two logically-distinct changes plus a small ghostty config tweak.
User-elected bundle (against atomic-PR ideal) — conscious deviation, not scope creep.
SDD-003 (Tier 4+5 of the SDD enforcement stack)
- scripts/check-spec-gate.sh: LOC threshold (>=50) + spec-folder presence
check, basename-aware lockfile exclusion (npm/pnpm/go), `skip-sdd` label +
rationale escape hatch, dependabot bypass.
- .github/workflows/spec-gate.yml: pull_request trigger, env-var pattern
(no `${{}}` in run: blocks).
- .github/pull_request_template.md: SDD checklist + skip-rationale header.
- .pre-commit-config.yaml + scripts/install-precommit.sh --with-sdd-gate:
opt-in pre-push hook for local pre-flight.
- tests/check-spec-gate.bats: 16 cases. tests/install-precommit.bats: +4 cases.
AI-019 (cross-agent model-tier policy)
- AGENTS.md: new "Model Selection (Task-Aware)" section between Standing
Orders and Competence Retention Protocol. Top / Mid / Low tiers, trigger
heuristics ("propose, don't force"), per-agent overlay pointers.
- ai/claude/CLAUDE.md, ai/gemini/GEMINI.md, ai/copilot/copilot-instructions.md,
ai/opencode/opencode.jsonc: ~6-line Model Tier subsection each with literal
model IDs (Claude empirical; OpenCode empirical; Gemini + Copilot marked TBD
pending validation).
- tests/opencode.bats: CLAUDE.md threshold bumped 70->80 with inline reason.
terminal/ghostty/config: bell-features=no-system, window-vsync=true (user-authored
session tweaks, bundled at user request).
Specs at specs/SDD-003-ci-spec-gate/ and specs/AI-019-model-tier-policy/.
AUDIT-004 architecture map landed separately in the vault via Hive auto-commit.
Tests: bats 645/645 green; shellcheck --severity=error clean; opencode.jsonc
structurally valid (top-level keys + 5 MCP servers intact); JSON workflow valid.
This was referenced May 20, 2026
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Summary
Two logically-distinct changes bundled by user decision (against atomic-PR ideal — conscious deviation, not scope creep) plus a small ghostty config tweak the user authored mid-session.
AGENTS.mdwith per-agent overlay pointers carrying the literal model IDs (Top / Mid / Low tiers, "propose-don't-force" trigger heuristics).terminal/ghostty/configgainsbell-features=no-system+window-vsync=true(user-authored).SDD checklist
SDD-003-ci-spec-gate,AI-019-model-tier-policy,AUDIT-004-architecture-map)specs/SDD-003-ci-spec-gate/andspecs/AI-019-model-tier-policy/proposal.mdfilled for both (Why / What / Acceptance criteria / Risks)tasks.mdin TDD order for bothverification.mdfilled for both with evidence + test outputsfeatures.json(SDD-003) tracks 13 features inpendingstate pre-mergeSDD skip rationale
Test plan
bats tests/*.bats→ 645/645 pass (16 new SDD-003 cases + 4 new install-precommit cases)shellcheck --severity=error scripts/*.sh setup-linux.shcleanpython3JSONC validation onai/opencode/opencode.jsonc(top-level keys + 5 MCP servers intact)python3 -c "import yaml; yaml.safe_load(...)"on.github/workflows/spec-gate.ymlcleanspecs/<feature-id>/folders → expected to PASS the spec-gate (case B)Notable decisions
origin/main; pre-commit would falsely fail intermediate WIP commits during red-green-refactor.//comments instead of_modelTierCommentJSON key — the file already uses//extensively; adding the model-tier block as comments is diff-friendly and avoids polluting the parsed JSON namespace.tests/opencode.bats(model-tier addition is intentional cross-agent consistency, not slippage).Out of scope (for future PRs)
verification.md; ADR-010 is the natural sibling)Companion vault artifact
30-architecture/dotfiles-architecture-map.md(AUDIT-004) landed in the vault via Hive auto-commit ahead of this PR. Two Mermaid diagrams (setup-time + runtime data flow) + 23-row "where does X live" reference table — used as baseline for the queued AUDIT-001/002/003.