feat: enhance roadmap with detailed tasks and acceptance criteria; update database documentation and query management

docs/database/0001-initial-schema.md

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+# 0001 Initial Schema
+
+SQL file: `supabase/schema.sql`
+
+## Purpose
+
+This is the first registered database query file for the project. It represents the schema that existed before the Freelancer OS MVP planning work started.
+
+## What It Creates
+
+- `journals`
+- `tasks`
+- `chat_sessions`
+- `chat_messages`
+- `profiles`
+- Row Level Security policies for the tables above
+- `handle_new_user()` trigger function for profile creation
+- `on_auth_user_created` trigger
+- `avatars` storage bucket and related storage policies
+
+## Current Product Fit
+
+This schema supports the earlier MindSpace/Cognis prototype:
+
+- mood/energy journals
+- basic tasks
+- chat history
+- user profile storage
+- avatar uploads
+
+It does not yet fully match the Freelancer OS MVP model.
+
+## Known Gaps For MVP
+
+The Freelancer OS MVP still needs new schema additions for:
+
+- `clients`
+- `projects`
+- `calendar_events`
+- `finance_transactions`
+- `daily_logs`
+- `app_settings`
+
+The existing `journals` table can either be migrated into `daily_logs` or kept as a legacy table until the UI is moved to the new model.
+
+## Execution Notes
+
+This file should be treated as the first baseline. If it has already been run in a Supabase project, do not rerun it blindly because some `create table` and `create policy` statements are not idempotent.
+
+Future changes should be added as ordered migration files rather than editing this baseline after execution.
+