Copilot instructions

1---
2description: 'Cross-session memory: read known facts at start, persist decisions at end.'
3applyTo: '**'
4---
5 
6# Cross-Session Memory
7 
8## At Session Start
9 
10Read `/memories/*.md` files to restore project context, past decisions, and known
11pitfalls before beginning any work.
12 
13If no memory files exist yet, proceed without them -- they will be created as work
14progresses.
15 
16## During Work
17 
18Note significant decisions, failed approaches, and key facts in `/memories/` as they
19occur -- not just at session end. Create or update files as needed:
20 
21- `/memories/decisions.md` -- architectural and design decisions
22- `/memories/pitfalls.md` -- approaches that failed and why
23- `/memories/conventions.md` -- project-specific patterns discovered
24- `/memories/session/` -- temporary in-progress notes for this session
25 
26## At Session End
27 
28Update `/memories/` with:
29 
30- Decisions made and rationale (append to `decisions.md`)
31- Approaches that failed and why (append to `pitfalls.md`)
32- Current state and next steps (update `session/progress.md`)
33- Any new project conventions discovered (append to `conventions.md`)
34 
35## Memory File Format
36 
37Keep entries short and concise -- use brief bullet points, not lengthy prose:
38 
39```markdown
40<!-- decisions.md -->
41- 2025-01-15: Chose PostgreSQL over MongoDB for relational data model (#42)
42- 2025-01-16: Using Playwright for E2E tests, not Cypress (team preference)
43```
44 
45