55-Decision & Change Log Template v1.0 | Chapter 13 Sample Manuscripts

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Chapter 13 Sample Manuscripts

I. Chapter Goals & Scope (Mandatory)

• Provide copy-ready high-quality samples covering: a complete DR (human + machine), a rollback-inclusive variant, common-error comparisons, and reusable snippets.
• Fully conform to: unified symbols & metrology, state machine, gates, and citation caliber (Volume + Version + Anchor S/P/M/I).

II. Sample A: Unifying Arrival-Time Caliber (Full DR, human prose)

1. Cover & Abstract
   • DR ID: DR-2025-0216; Status: Review; Requester: Zhang; Created: 2025-09-27.
   • Abstract: Cross-volume T_arr expressions diverge; unify to the general form while keeping the factored form as an exception.
2. Problem / Motive
   Existing white papers and implementations use both T_arr = ( 1 / c_ref ) * ( ∫ n_eff d ell ) and T_arr = ( ∫ ( n_eff / c_ref ) d ell ), causing verification and replay inconsistencies.
3. Options & Evidence
   • Option A (general): T_arr = ( ∫ ( n_eff / c_ref ) d ell ).
   • Option B (factored): T_arr = ( 1 / c_ref ) * ( ∫ n_eff d ell ), only when c_ref is approx. constant over the segment.
   • Evidence: cmb_set_v3, lens_v1; script arrive_time_check.py@a1b2c3; CI_95% via bootstrap.
4. Impact (Summary)
   Performance: Eval gate_accuracy ≥ 0.99@7d; Compatibility: compat_rate ≥ 0.995@replay; Cost down by ~10%.
5. Decision & Non-Do
   • Decision: adopt the general form; allow constant factoring in region L2 with an explicit exception.
   • Non-Do: no changes to API v1 consumers; no renaming/removal of existing data-spec fields.
6. Rollback Design
   • Triggers: gate_accuracy<0.98@7d or compat_rate<0.99@replay.
   • Steps: switch to release-stable → restore snapshots → restoration regression → observe 24h.
7. Implementation & Verification (Summary)
   • Envs: dev/stage/prod; flag: feature.tarr.general_form=true.
   • Hard gates: gate_accuracy>=0.99@7d, compat_rate>=0.995@replay.
   • Path & measure: gamma(ell) is the observation path; d ell is the arc-length element; check_dim=true.
8. References & Notes
   See 《EFT.WP.Core.Equations v1.1》 Ch.2 S20-1; 《EFT.WP.Core.Metrology v1.0》 Ch.1–3; 《EFT.WP.Core.DataSpec v1.0》 I30-*.

Sample A: Machine-Readable (YAML; copy-ready)

decision_record:

id: "DR-2025-0216"

title: "Unify T_arr to general form with scoped exception"

status: "Review"

requester: { name: "Zhang", role: "Requester" }

created_at: "2025-09-27"

motive: "Inconsistent T_arr expressions hinder verification and replay."

options:

- name: "A - general"

assumptions: []

pros: ["handles spatial variance in c_ref and n_eff"]

cons: ["slightly higher expression complexity"]

- name: "B - factored"

assumptions: ["c_ref approx. constant within segment"]

pros: ["concise"]

cons: ["sensitive to c_ref drift"]

decision: "Adopt general T_arr; allow factored as exception for region L2."

impact:

dimensions:

performance: { metric:"gate_accuracy", target: ">=0.99@7d", baseline:0.97, after:0.995, sigma:0.003, weight:0.30 }

compatibility:{ metric:"compat_rate", target: ">=0.995@replay", baseline:0.98, after:0.996, sigma:0.004, weight:0.10 }

cost: { metric:"unit_cost", target: "<=1.0x@base", baseline:1.00, after:0.90, sigma:0.030, weight:0.15 }

scoring: { k_sigma: 1.0 }

rollback:

triggers: ["gate_accuracy<0.98@7d","compat_rate<0.99@replay"]

steps: ["switch_traffic: release-stable","restore_snapshot: params@2025-09-20","run_suite: restoration_regression","observe: 24h"]

verification:

gates:

hard: ["gate_accuracy>=0.99@7d","compat_rate>=0.995@replay"]

regression_suite:

cases: ["cmb_set_v3","lens_v1"]

references:

see:

- "EFT.WP.Core.Equations v1.1:S20-1"

- "EFT.WP.Core.Metrology v1.0:check_dim"

- "EFT.WP.Core.DataSpec v1.0:I30-2"

arrival_time:

form: "general"

path: "gamma(ell)"

measure: "d ell"

c_ref: "ref:L2"

n_eff_profile: "dataset:cmb_set_v3@v3"

check_dim: true

III. Sample B: Differential Adjudication with Rollback Loop (Concise, human)

• Cover & Abstract: DR-2025-0220; Status: Approved; Decision: keep general form; allow constant-factoring in regions L2/L3 for 30 days.
• Risks & Triggers: incident_level>=2@24h or data_drift>0.03@14d triggers rollback.
• Rollback Execution:
  Freeze writes → switch to release-20250930-1.3.2 → restore schema@v2.2 → run restoration_smoke + restoration_regression.
• Restoration Verification (Hard gates): gate_accuracy>=0.99@24h, compat_rate>=0.995@replay, gate_error_rate<=1e-3@24h.
• Sign-off & Comms: internal oncall/owner/auditor; external status_page.

Sample B: Machine-Readable (YAML)

decision_record:

id: "DR-2025-0220"

title: "Scoped exception for T_arr factoring in L2/L3"

status: "Approved"

exceptions:

- name: "Factoring in L2/L3"

domain: ["region:L2","region:L3"]

until: "2025-10-31"

recheck_gates: ["compat_rate>=0.995@replay"]

owner: "Approver/Owner"

rollback_plan:

freeze_io: true

baseline: "release-20250930-1.3.2"

steps:

- "switch_traffic: release-20250930-1.3.2"

- "restore_snapshot: schema@v2.2"

- "run_suite: restoration_smoke"

- "run_suite: restoration_regression"

- "observe: 24h"

success_gates:

- "gate_accuracy>=0.99@24h"

- "gate_error_rate<=1e-3@24h"

- "compat_rate>=0.995@replay"

communication:

internal: ["oncall","owner","auditor"]

external: { channels: ["status_page"] }

references:

see:

- "EFT.WP.Core.Equations v1.1:S20-1"

- "EFT.WP.Core.Metrology v1.0:check_dim"

IV. Common Errors vs Fixes (Copy-ready)

V. Reusable Snippet Library (Paste-ready)

1) References & Anchors

references:

see:

- "EFT.WP.Core.Terms v1.0:P10-3"

- "EFT.WP.Core.Equations v1.1:S20-1"

- "EFT.WP.Core.Metrology v1.0:check_dim"

- "EFT.WP.Core.DataSpec v1.0:I30-2"

2) Gates

verification:

gates:

hard: ["gate_accuracy>=0.99@7d","compat_rate>=0.995@replay"]

soft: ["unit_cost<=1.0x@30d"]

3) Arrival-Time Context

arrival_time:

form: "general" # general|factored

path: "gamma(ell)"

measure: "d ell"

c_ref: "ref:L2"

n_eff_profile: "dataset:cmb_set_v3@v3"

check_dim: true

4) Rollback Triggers

triggers:

- "gate_accuracy<0.98@7d"

- "compat_rate<0.99@replay"

- "incident_level>=2@24h"

- "data_drift>0.03@14d"

5) Audit Trail Fields

audit_trail:

record: ["timestamp","actor","from","to","gate","evidence_hash","notes"]

VI. Human × Machine Alignment (Checklist)

VII. Release-Readiness Assertions (Minimal)

• Assertions: hard_gates_passed=true; audit_artifacts in ["yaml","json","pdf"]; anchors_present=true; rollback_ready=true.
• Close-out: tag release-<date>-<semver>, freeze changes; update version graph and notice cadence.