chore: use more conventional XDG_CONFIG_HOME for config

docs/Architecture.md

@@ -123,7 +123,7 @@ Wraps Vercel AI SDK `generateText()` with:
 - Normalized `LLMResponse` type
 
 ### SessionManager
-Persists conversation history to JSONL files in `~/.nanobot/sessions/`.
+Persists conversation history to JSONL files in `~/.config/nanobot/sessions/`.
 
 - Key format: `{channel}:{chatId}` (e.g., `mattermost:abc123`)
 - Supports history truncation for context window limits
@@ -136,7 +136,7 @@ When session history exceeds token limits, summarizes old messages and archives
 
 ## Configuration
 
-- File: `~/.nanobot/config.json`
+- File: `~/.config/nanobot/config.json`
 - Validation: Zod schemas in `src/config/types.ts`
 - Env overrides: `NANOBOT_MODEL`, `NANOBOT_WORKSPACE`, `NANOBOT_CONFIG`
 

docs/Discoveries.md

@@ -129,7 +129,7 @@ const timeout = parseInt(strArg(args, 'timeout', '30'), 10);
 ## Session Persistence
 
 - Format: JSONL (one JSON object per line)
-- Location: `~/.nanobot/sessions/{sessionKey}.jsonl`
+- Location: `~/.config/nanobot/sessions/{sessionKey}.jsonl`
 - Tool results truncated at 16,000 characters
 - Memory consolidation triggered when approaching context window limit
 
@@ -147,5 +147,5 @@ Max 3 attempts with exponential backoff.
 
 1. CLI flags (`-c`, `-m`, `-w`, `-M`)
 2. Environment variables (`NANOBOT_CONFIG`, `NANOBOT_MODEL`, `NANOBOT_WORKSPACE`)
-3. Config file (`~/.nanobot/config.json`)
+3. Config file (`~/.config/nanobot/config.json`)
 4. Zod schema defaults