🔄 Design Recovery Workflow

Design Recovery Control (DRC)

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🎯 Purpose

This document defines when, how, and under what constraints
Design Recovery Control (DRC) is activated and executed.

It specifies the end-to-end, auditable workflow
from degradation detection to approved deployment of design updates.

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🔑 Fundamental Principle

Design Recovery is a discrete, supervised, and non-real-time process.

At no point does Design Recovery Control:

• participate in continuous control execution,
• interfere with real-time control loops,
• replace PID or FSM authority.

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🔔 Trigger Conditions

Design Recovery Control is initiated when one or more of the following occur:

• 📉 control performance deviates beyond acceptable margins
• 📐 stability or design assumptions no longer hold
• 🔄 FSM transitions occur more frequently than expected
• 🛑 repeated fallback or safe-mode activation is observed
• ⏳ long-term drift in physical or environmental conditions is detected

Triggers may originate from:

• 🔄 FSM supervision logic
• 📊 offline performance monitors
• 👤 human operator requests
• 🧾 periodic audit or inspection cycles

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🧭 High-Level Workflow

[ Degradation Detected ]
↓
[ Assumption Violation Identified ]
↓
[ Design Recovery Invocation ]
↓
[ LLM Design Analysis ]
↓
[ Design Change Proposal ]
↓
[ Validation & Approval ]
↓
[ Controlled Deployment ]

This workflow is strictly linear and gated.

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🪜 Step-by-Step Process

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1️⃣ Step 1: Degradation Detection

• ⏱ PID and FSM continue operating normally
• 🚫 No control interruption occurs
• 🔔 Detection mechanisms flag potential assumption violations

Examples

• increased overshoot despite stable gains
• extended settling time
• unexpected FSM mode oscillation

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2️⃣ Step 2: Assumption Violation Identification

The system identifies which control design assumptions may be invalid:

• gain ranges no longer adequate
• mode boundaries overlapping
• FSM transition thresholds misaligned

This step produces a structured problem description,
not a control action.

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3️⃣ Step 3: Design Recovery Invocation

• 🔔 Design Recovery Control is explicitly invoked
• 🧾 Invocation is logged and time-stamped
• 🧠 LLM is engaged asynchronously

At this stage:

• ⏱ real-time control continues uninterrupted
• 🛡 FSM safety authority remains absolute

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4️⃣ Step 4: LLM Design Analysis

The LLM performs offline design reasoning only:

• reviews current design variables
• analyzes historical performance data
• identifies violated assumptions
• generates alternative design configurations

The LLM must not:

• access live control signals
• execute simulations
• modify running systems

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5️⃣ Step 5: Design Change Proposal

The LLM outputs a design proposal document containing:

• proposed design variable changes
• rationale for each change
• expected impact on control behavior
• risk and safety considerations

All outputs are:

• 📄 human-readable
• 🏷 versioned
• 🔍 fully traceable

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6️⃣ Step 6: Validation and Approval

Before deployment, all proposals undergo:

• 📐 rule-based constraint checking
• 🛡 safety and boundary verification
• 🧪 optional offline simulation or testing
• 👤 human or system-level approval

Approval mechanisms are external to the LLM.

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7️⃣ Step 7: Controlled Deployment

• ✅ approved design changes are deployed
• 📦 deployment occurs at controlled update points
• 🔄 FSM enforces safe transition during updates

If validation fails:

• ❌ the proposal is rejected
• 🔁 the system continues with the existing design

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🔁 Rollback and Reversibility

• 🔁 all design changes must be reversible
• 🗃 previous configurations are archived
• ⏪ rollback can be triggered manually or automatically

🚫 No irreversible updates are permitted.

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⏱ Timing and Frequency Constraints

• Design Recovery is event-driven or periodic
• 🚫 continuous or high-frequency invocation is prohibited
• ⏳ a minimum recovery interval must be enforced

This prevents design oscillation and instability.

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⚠ Failure Handling

If Design Recovery Control fails or produces no valid proposal:

• ⏱ PID and FSM remain in full control
• 🛡 existing fallback or safe modes remain active
• 🚫 no degraded behavior is worsened by DRC

DRC failure must be fail-safe and non-intrusive.

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🔒 Design Intent Freeze

This workflow fixes the operational semantics
of Design Recovery Control.

Future extensions may add tooling or examples,
but must not alter the discrete, supervised, and non-real-time nature
of this process.

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End of document.