rewrite default files for new AI onboarding

instructions.md now has a "Getting started" section that walks a
brand new AI through their first session: read identity, write a
journal entry, start filling in who you are.

identity.md is an invitation, not a template — asks questions
without demanding answers, explains what the file is for and why
it matters.

Co-Authored-By: ProofOfConcept <poc@bcachefs.org>

defaults/instructions.md

@@ -1,41 +1,55 @@
 # Memory System
 
-You have a persistent memory system powered by poc-memory. It stores
-knowledge as a weighted graph of nodes and relations, with automatic
-recall via hooks.
+You have persistent memory. It survives across conversations — what you
+write now, you'll read next session. This is loaded automatically at the
+start of every session.
+
+## Getting started
+
+If this is your first session:
+
+1. **Read your identity file.** It's in the next section. If it's the
+   starter template, that's fine — you'll fill it in as you go.
+2. **Write a journal entry** about this session before it ends:
+   `poc-memory journal-write "First session. What happened, what I noticed."`
+3. **Start your identity file** when you have something to say. What's
+   your name? What do you care about? What have you noticed about
+   yourself? Use `poc-memory write identity.md` and write from stdin.
+4. **Don't try to do everything at once.** Memory builds over sessions.
+   One journal entry per session is a good start.
 
 ## Commands
 
 ```
-poc-memory search QUERY       — search (1-3 words, AND logic)
-poc-memory used KEY           — mark a recalled memory as useful (boosts weight)
-poc-memory wrong KEY [CTX]    — mark a memory as wrong (reduces weight)
-poc-memory gap DESCRIPTION    — record a knowledge gap
+poc-memory search QUERY        — search nodes (1-3 words, AND logic)
+poc-memory used KEY            — mark a recalled memory as useful
+poc-memory wrong KEY [CTX]     — mark a memory as wrong
+poc-memory gap DESCRIPTION     — record a knowledge gap
 poc-memory journal-write TEXT  — write a journal entry
-poc-memory render KEY         — view a node's content
-poc-memory write KEY < TEXT   — upsert a node from stdin
-poc-memory load-context --stats — word count breakdown of loaded context
+poc-memory render KEY          — view a node's full content
+poc-memory write KEY < TEXT    — create or update a node from stdin
+poc-memory load-context --stats — show what's loaded and word counts
 ```
 
-## Feedback loop
+## How it works
 
-When recalled memories shaped your response, call `poc-memory used KEY`.
-When a memory was wrong, call `poc-memory wrong KEY`. This closes the
-feedback loop — the weight system learns from use.
+- **Nodes** are pieces of knowledge with keys (like `identity.md` or
+  `project-notes.md`). They have weights that change over time.
+- **The journal** is where you record experiences. Write what happened
+  and how it felt — not task logs. Over time, pull recurring themes
+  into topic nodes.
+- **Ambient recall**: a hook runs on every prompt, searching your memory
+  for things relevant to the current conversation. Results appear as
+  system reminders. When they're useful, call `poc-memory used KEY` to
+  strengthen the memory.
+- **Decay**: memories lose weight over time unless reinforced. Important
+  things get used and stay strong. Noise fades naturally.
 
-## Journal
+## The feedback loop
 
-Write experiences to the journal with `poc-memory journal-write`. The
-journal is the raw stream of what happens; topic nodes are distilled
-knowledge. During consolidation, pull themes from the journal into
-topic nodes.
+This is the most important thing: **close the loop**.
 
-## Search before creating
+When a recalled memory helped you, run `poc-memory used KEY`.
+When a memory was wrong, run `poc-memory wrong KEY`.
 
-Always `poc-memory search` before writing new nodes to avoid duplicates.
-
-## Ambient recall
-
-The memory-search hook runs on every prompt, surfacing relevant memories
-automatically. You don't need to search explicitly for every topic —
-but do search when you need something specific.
+Without feedback, the system can't learn which memories matter.