docs: consolidate all docs under docs/ — single source of truth

Move issues (01–29) and PRD from .scratch/distributed-inference-network/
into docs/issues/ and docs/. Update ralph_progress.py DEFAULT_PRD path
and rewrite docs/agents/issue-tracker.md to reflect the new layout.

The distributed_inference_network.egg-info/docs/ mirror is a build
artifact already covered by *.egg-info/ in .gitignore — not committed.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/issues/10-meshnet-sdk.md

@@ -0,0 +1,44 @@
+Status: ready-for-agent
+
+# 10 — `meshnet` Python SDK
+
+## What to build
+
+A Python SDK (`packages/sdk`) that wraps the OpenAI-compatible gateway and exposes network-specific controls that the raw OpenAI SDK cannot express. The SDK is the recommended interface for developers who want more than basic inference.
+
+The SDK surface:
+
+```python
+from meshnet import Client
+
+client = Client(api_key="...", base_url="https://api.meshnet.ai")
+
+# Basic inference (identical to OpenAI SDK)
+response = client.chat.completions.create(model="llama-3-70b", messages=[...])
+
+# Network-specific features
+client.wallet.balance()          # SOL/USDC balance remaining
+client.wallet.top_up(amount_sol=1.0)   # returns a Solana payment address + QR
+client.models.available()        # list of routable model presets with shard coverage %
+client.request(redundancy=2)     # route through 2 independent chains, return majority
+client.estimate_cost(model="llama-3-70b", tokens=1000)  # cost in SOL before sending
+```
+
+The SDK must not require clients to hold or know about our native token. All wallet operations are in SOL or USDC.
+
+## Acceptance criteria
+
+- [ ] `pip install meshnet` installs the SDK
+- [ ] `Client.chat.completions.create(...)` works identically to the OpenAI SDK (same parameters, same response shape)
+- [ ] `client.wallet.balance()` returns the current SOL/USDC balance for the API key
+- [ ] `client.wallet.top_up()` returns a valid Solana payment address
+- [ ] `client.models.available()` returns model presets with shard coverage percentage
+- [ ] `client.estimate_cost(model, tokens)` returns a cost estimate in SOL before the request is sent
+- [ ] `client.request(redundancy=2)` sends the same prompt to two independent inference routes and returns the majority response
+- [ ] The SDK is typed (py.typed, full type stubs)
+- [ ] An integration test covers each SDK method against a local gateway + tracker + stub nodes
+
+## Blocked by
+
+- `05-openai-compatible-gateway.md`
+- `06-solana-stake-and-settlement.md`