5.1 KiB
M09 Summary — Execution Context Introduction
📌 Milestone Summary — M09: Execution Context Introduction
Project: Serena
Phase: Phase II — Runtime Seam Preparation
Milestone: M09 — Execution context introduction
Timeframe: 2026-03-11 → 2026-03-12
Status: Closed
Baseline: 710a0abd (M08 merge)
Refactor Posture: Behavior-Preserving
1. Milestone Objective
M09 existed to introduce a lightweight runtime execution context that groups model, opts_snapshot, device, state, and cmd_opts. The context is attached to the processing object as p.runtime_context but is write-only in M09 — no migration of shared.* reads yet.
What would remain unsafe or ungoverned if this refactor did not occur? The runtime would lack a single object grouping its dependencies, blocking Phase III ProcessingRunner and testable runtime extraction. Extensions would remain coupled to global shared state with no seam for future isolation.
2. Scope Definition
In Scope
modules/runtime_context.py— New RuntimeContext dataclass (model, opts_snapshot, device, state, cmd_opts)modules/processing.py— Attach p.runtime_context in process_images_inner() after opts_snapshot creation- CI: Linter, Smoke Tests (PR), Quality Tests (post-merge)
- Documentation: M09_plan.md, M09_toolcalls.md, M09_run1.md, M09_run2.md
Out of Scope
- Migration of shared.sd_model, shared.device, shared.state, shared.cmd_opts reads
- Extension interface changes
- Sampling behavior changes
- API/CLI changes
3. Refactor Classification
Change Type
Mechanical refactor — Add new dataclass and assign it to p.runtime_context. No logic change; additive only.
Observability
- API responses: Unchanged
- CLI output: Unchanged
- File formats / save paths: Unchanged
- Model outputs: Unchanged
4. Work Executed
- Created modules/runtime_context.py with RuntimeContext dataclass
- Added import and assignment in process_images_inner() after p.opts_snapshot
- No functional logic changed; context populated from shared.* but not consumed
- Files changed: modules/runtime_context.py (new), modules/processing.py, docs/milestones/M09/*
5. Invariants & Compatibility
Declared Invariants (must by default Not Change)
- Generation behavior unchanged (same inputs → same outputs)
- File output behavior unchanged
- Extension compatibility (shared.* unchanged)
- API compatibility (txt2img/img2img)
- CLI behavior unchanged
Compatibility Notes
- Backward compatibility preserved: Yes
- Breaking changes introduced: No
- Deprecations introduced: No
6. Validation & Evidence
| Evidence Type | Tool/Workflow | Result | Notes |
|---|---|---|---|
| Linter | ruff, eslint | ✓ | PR #26 |
| Smoke Tests | pytest test/smoke | ✓ | PR #26, run 22984770373 |
| Quality Tests | pytest test/smoke test/quality | ✓ | Post-merge 22986731960 |
| Coverage | ≥40% gate | ✓ | 40% combined; runtime_context.py 100% |
| verify_pinned_deps | scripts/ci/verify_pinned_deps.sh | ✓ | Quality Tests |
| pip-audit | Informational | ⚠ | Deferred M27 |
7. CI / Automation Impact
- Workflows affected: None (unchanged)
- Checks added/removed: None
- Enforcement: Unchanged
- Signal drift: None observed
8. Issues, Exceptions, and Guardrails
No new issues were introduced during this milestone.
9. Deferred Work
- pip-audit vulnerabilities: Pre-existing from M04; deferred to M27. Status unchanged.
10. Governance Outcomes
- Runtime seam stack now includes execution context: fifth Phase II seam
- Phase II — Runtime Seam Preparation complete
- Invariants preserved and verified by CI
What is now provably true that was not provably true before? The generation runtime exposes p.runtime_context grouping model, opts_snapshot, device, state, cmd_opts. This completes Phase II and enables Phase III ProcessingRunner and shared state reduction.
11. Exit Criteria Evaluation
| Criterion | Status | Evidence |
|---|---|---|
| RuntimeContext introduced | Met | modules/runtime_context.py |
| Context attached to processing object | Met | p.runtime_context in process_images_inner |
| CI fully green | Met | Linter, Smoke, Quality ✓ |
| No behavior change | Met | Smoke + quality pass |
| Milestone artifacts generated | Met | Plan, toolcalls, run1, run2, audit, summary |
| Ledger updated | Met | docs/serena.md |
| Tag created | Met | v0.0.09-m09 |
12. Final Verdict
Milestone objectives met. Refactor verified safe. Phase II complete. Proceed to Phase III (M10).
13. Authorized Next Step
M10 — ProcessingRunner skeleton. No additional constraints.
14. Canonical References
- Commit:
2c6a2510(merge) - PR: #26 (https://github.com/m-cahill/serena/pull/26)
- CI Run 1 — Linter: 22984770390; Smoke: 22984770373
- CI Run 2 — Quality: 22986731960; Linter: 22986731933
- Tag: v0.0.09-m09
- Documents: docs/milestones/M09/M09_plan.md, M09_run1.md, M09_run2.md, M09_audit.md, M09_summary.md