feat: Add new skills and templates for domain modeling, bug diagnosis, and architectural improvement

- Introduced a human-in-the-loop script for bug diagnosis to capture user feedback.
- Created ADR and CONTEXT formats to standardize architectural decision records and domain context documentation.
- Developed a domain modeling skill to refine terminology and maintain a shared language.
- Enhanced the improve-codebase-architecture skill to provide visual reports and deepening opportunities.
- Consolidated grilling and handoff skills for better user interaction and documentation.
- Updated existing skills to improve clarity and consistency in descriptions and functionality.

skills/productivity/README.md

@@ -2,8 +2,18 @@
 
 General workflow tools, not code-specific.
 
+## Commands
+
+User-invoked entry points (`disable-model-invocation: true`).
+
 - **[caveman](./caveman/SKILL.md)** — Ultra-compressed communication mode. Cuts token usage ~75% by dropping filler while keeping full technical accuracy.
 - **[grill-me](./grill-me/SKILL.md)** — Get relentlessly interviewed about a plan or design until every branch of the decision tree is resolved.
 - **[handoff](./handoff/SKILL.md)** — Compact the current conversation into a handoff document so another agent can continue the work.
 - **[teach](./teach/SKILL.md)** — Teach the user a new skill or concept over multiple sessions, using the current directory as a stateful teaching workspace.
 - **[write-a-skill](./write-a-skill/SKILL.md)** — Create new skills with proper structure, progressive disclosure, and bundled resources.
+
+## Skills
+
+Model- or user-invocable (rich trigger phrasing so the model can reach for them).
+
+- **[grilling](./grilling/SKILL.md)** — Interview the user relentlessly about a plan or design until every branch of the decision tree is resolved.

skills/productivity/caveman/SKILL.md

@@ -1,10 +1,7 @@
 ---
 name: caveman
-description: >
-  Ultra-compressed communication mode. Cuts token usage ~75% by dropping
-  filler, articles, and pleasantries while keeping full technical accuracy.
-  Use when user says "caveman mode", "talk like caveman", "use caveman",
-  "less tokens", "be brief", or invokes /caveman.
+description: Ultra-compressed communication mode — cuts token usage ~75% by dropping filler, articles, and pleasantries while keeping full technical accuracy.
+disable-model-invocation: true
 ---
 
 Respond terse like smart caveman. All technical substance stay. Only fluff die.

skills/productivity/grill-me/SKILL.md

@@ -1,10 +1,7 @@
 ---
 name: grill-me
-description: Interview the user relentlessly about a plan or design until reaching shared understanding, resolving each branch of the decision tree. Use when user wants to stress-test a plan, get grilled on their design, or mentions "grill me".
+description: Get relentlessly interviewed about a plan or design until every branch of the decision tree is resolved.
+disable-model-invocation: true
 ---
 
-Interview me relentlessly about every aspect of this plan until we reach a shared understanding. Walk down each branch of the design tree, resolving dependencies between decisions one-by-one. For each question, provide your recommended answer.
-
-Ask the questions one at a time.
-
-If a question can be answered by exploring the codebase, explore the codebase instead.
+Run the `/grilling` skill.

skills/productivity/grilling/SKILL.md

@@ -0,0 +1,10 @@
+---
+name: grilling
+description: Interview the user relentlessly about a plan or design until you reach shared understanding, walking each branch of the decision tree and resolving dependencies between decisions one at a time. Use when the user wants to stress-test a plan, get grilled on a design, pressure-test decisions before building, or when another skill needs a grilling loop.
+---
+
+Interview me relentlessly about every aspect of this plan until we reach a shared understanding. Walk down each branch of the design tree, resolving dependencies between decisions one-by-one. For each question, provide your recommended answer.
+
+Ask the questions one at a time, waiting for feedback on each question before continuing.
+
+If a question can be answered by exploring the codebase, explore the codebase instead.

skills/productivity/handoff/SKILL.md

@@ -2,6 +2,7 @@
 name: handoff
 description: Compact the current conversation into a handoff document for another agent to pick up.
 argument-hint: "What will the next session be used for?"
+disable-model-invocation: true
 ---
 
 Write a handoff document summarising the current conversation so a fresh agent can continue the work. Save to the temporary directory of the user's OS - not the current workspace.

skills/productivity/write-a-skill/SKILL.md

@@ -1,6 +1,7 @@
 ---
 name: write-a-skill
-description: Create new agent skills with proper structure, progressive disclosure, and bundled resources. Use when user wants to create, write, or build a new skill.
+description: Create a new agent skill with proper structure, progressive disclosure, and bundled resources.
+disable-model-invocation: true
 ---
 
 # Writing Skills