Codex/whe 15 bootstrap workspace (#1)

* feat(WHE-15): bootstrap bun workspace with app and package scaffolds

* chore(WHE-17): switch workspace typecheck to tsgo

* chore(WHE-16): configure oxlint and oxfmt no-semicolon style

* chore: address CodeRabbit review feedback

* chore: apply coderabbit fixes and add review script

* docs: add ADR decision metadata

docs/specs/HOUSEBOT-002-finance-domain-model.md

@@ -1,33 +1,40 @@
 # HOUSEBOT-002: Finance Domain Model
 
 ## Summary
+
 Define domain entities and invariants for rent, utilities, shared purchases, and monthly settlements.
 
 ## Goals
+
 - Create a deterministic model for monthly household accounting.
 - Encode money-safe arithmetic with integer minor units.
 - Support equal split by default with optional day-based utility override.
 
 ## Non-goals
+
 - Telegram command handlers.
 - Mini app rendering.
 
 ## Scope
+
 - In: domain entities, use-case contracts, and validation rules.
 - Out: persistence adapter implementation.
 
 ## Interfaces and Contracts
+
 - `Money` value object (`currency: GEL`, `amountMinor: bigint | number`).
 - `SettlementInput` contract with members, rent, utilities, purchases, overrides.
 - `SettlementResult` contract with per-member due and explanation lines.
 
 ## Domain Rules
+
 - Rent is fixed per cycle and split equally among active members.
 - Utilities split equally unless per-member day override is provided.
 - Shared purchases reduce payer due amount and distribute cost across members.
 - No floating-point operations.
 
 ## Data Model Changes
+
 - Define required table contracts (implemented in later DB ticket):
   - `billing_cycles`
   - `rent_rules`
@@ -37,20 +44,24 @@ Define domain entities and invariants for rent, utilities, shared purchases, and
   - `settlements`, `settlement_lines`
 
 ## Security and Privacy
+
 - Do not store unnecessary personal data.
 - Use internal IDs for members in calculations.
 
 ## Observability
+
 - Structured calculation logs (input hash, cycle id, result totals).
 - Error event on invalid settlement state.
 
 ## Edge Cases and Failure Modes
+
 - Member count is zero.
 - Utility day overrides sum to zero.
 - Negative amounts from malformed inputs.
 - Duplicate purchase entries.
 
 ## Test Plan
+
 - Unit:
   - money arithmetic and normalization
   - equal split and day-weighted split cases
@@ -59,10 +70,12 @@ Define domain entities and invariants for rent, utilities, shared purchases, and
 - E2E: not in this ticket.
 
 ## Acceptance Criteria
+
 - [ ] Value objects implemented and tested.
 - [ ] Settlement input/output contracts defined.
 - [ ] Deterministic settlement math covered by tests.
 - [ ] Edge cases produce explicit domain errors.
 
 ## Rollout Plan
+
 - Merge as dependency for settlement engine and bot handlers.