Merge branch 'main' into changeset-opsx-experimental-workflow

Adds documentation for the experimental artifact-based workflow:
- Setup instructions (Claude Code only for now)
- Command reference for all /opsx:* commands
- Usage examples and tips
- Comparison with standard workflow
- Feedback links to Discord and GitHub

.changeset/opsx-experimental-workflow.md

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+---
+"@fission-ai/openspec": minor
+---
+
+Add OPSX experimental workflow commands and enhanced artifact system
+
+**New Commands:**
+- `/opsx:ff` - Fast-forward through artifact creation, generating all needed artifacts in one go
+- `/opsx:sync` - Sync delta specs from a change to main specs
+- `/opsx:archive` - Archive completed changes with smart sync check
+
+**Artifact Workflow Enhancements:**
+- Schema-aware apply instructions with inline guidance and XML output
+- Agent schema selection for experimental artifact workflow
+- Per-change schema metadata via `.openspec.yaml` files
+- Agent Skills for experimental artifact workflow
+- Instruction loader for template loading and change context
+- Restructured schemas as directories with templates
+
+**Improvements:**
+- Enhanced list command with last modified timestamps and sorting
+- Change creation utilities for better workflow support
+
+**Fixes:**
+- Normalize paths for cross-platform glob compatibility
+- Allow REMOVED requirements when creating new spec files

docs/experimental-workflow.md

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+# Experimental Workflow (OPSX)
+
+> **Status:** Experimental. Things might break. Feedback welcome on [Discord](https://discord.gg/BYjPaKbqMt).
+>
+> **Compatibility:** Claude Code only (for now)
+
+## What Is It?
+
+OPSX is a new way to work with OpenSpec changes. Instead of one big proposal, you build **artifacts** step-by-step:
+
+```
+proposal → specs → design → tasks → implementation → archive
+```
+
+Each artifact has dependencies. Can't write tasks until you have specs. Can't implement until you have tasks. The system tracks what's ready and what's blocked.
+
+## Setup
+
+```bash
+# 1. Make sure you have openspec installed and initialized
+openspec init
+
+# 2. Generate the experimental skills
+openspec artifact-experimental-setup
+```
+
+This creates skills in `.claude/skills/` that Claude Code auto-detects.
+
+## Commands
+
+| Command | What it does |
+|---------|--------------|
+| `/opsx:new` | Start a new change |
+| `/opsx:continue` | Create the next artifact |
+| `/opsx:ff` | Fast-forward (create all artifacts at once) |
+| `/opsx:apply` | Implement the tasks |
+| `/opsx:sync` | Sync delta specs to main specs |
+| `/opsx:archive` | Archive when done |
+
+## Usage
+
+### Start a new change
+```
+/opsx:new
+```
+You'll be asked what you want to build and which workflow schema to use.
+
+### Build artifacts step-by-step
+```
+/opsx:continue
+```
+Creates one artifact at a time. Good for reviewing each step.
+
+### Or fast-forward
+```
+/opsx:ff add-dark-mode
+```
+Creates all artifacts in one go. Good when you know what you want.
+
+### Implement
+```
+/opsx:apply
+```
+Works through tasks, checking them off as you go.
+
+### Sync specs and archive
+```
+/opsx:sync      # Update main specs with your delta specs
+/opsx:archive   # Move to archive when done
+```
+
+## What's Different?
+
+**Standard workflow** (`/openspec:proposal`):
+- One big proposal document
+- Linear phases: plan → implement → archive
+- All-or-nothing artifact creation
+
+**Experimental workflow** (`/opsx:*`):
+- Discrete artifacts with dependencies
+- Fluid actions (not phases) - update artifacts anytime
+- Step-by-step or fast-forward
+- Schema-driven (can customize the workflow)
+
+The key insight: work isn't linear. You implement, realize the design is wrong, update it, continue. OPSX supports this.
+
+## Schemas
+
+Schemas define what artifacts exist and their dependencies. Currently available:
+
+- **spec-driven** (default): proposal → specs → design → tasks
+- **tdd**: tests → implementation → docs
+
+Run `openspec schemas` to see available schemas.
+
+## Tips
+
+- Use `/opsx:ff` when you have a clear idea, `/opsx:continue` when exploring
+- Tasks track progress via checkboxes in `tasks.md`
+- Delta specs (in `specs/`) get synced to main specs with `/opsx:sync`
+- If you get stuck, the status command shows what's blocked: `openspec status --change "name"`
+
+## Feedback
+
+This is rough. That's intentional - we're learning what works.
+
+Found a bug? Have ideas? Join us on [Discord](https://discord.gg/BYjPaKbqMt) or open an issue on [GitHub](https://github.com/Fission-AI/openspec/issues).