chore: improve project consistency and add pre-commit hook (#1105)

## Summary

Address consistency issues identified during project review.

## Changes

- **Pre-commit hook**: Added `.git/hooks/pre-commit` that runs
`format.sh` and `build.sh` before commits (per AGENTS.md requirement)
- **clean.sh**: Now includes Main.Tests bin/obj/TestResults cleanup
- **km.sh**: Fixed shebang to use portable `/usr/bin/env bash`
- **KNOWN-ISSUES.md**: Documented 2 configuration limitations (hardcoded
index ID and index weights)

## Test plan

- [x] All 520 tests pass (306 Core + 214 Main)
- [x] Zero skipped tests
- [x] Code coverage at 83.82% (above 80% threshold)
- [x] `build.sh` passes with 0 warnings
- [x] `format.sh` passes
- [x] `coverage.sh` passes
- [x] Pre-commit hook runs successfully on commit

## Note

The pre-commit hook is created in `.git/hooks/` which is not tracked by
git. New clones will need to set up the hook.

Author: dluc

KNOWN-ISSUES.md

@@ -84,6 +84,36 @@ km search 'content:"user:password"'
 
 ---
 
+## Configuration Limitations
+
+### 4. Index ID Hardcoded
+
+**Status:** Known limitation
+
+**Issue:** Index ID is hardcoded as `"fts-main"` instead of being loaded from configuration.
+
+**Location:** `src/Core/Search/NodeSearchService.cs:77`
+
+**Impact:** Cannot configure multiple indexes per node.
+
+**Fix Required:** Load index configuration from node settings.
+
+---
+
+### 5. Index Weights Not Configurable
+
+**Status:** Known limitation
+
+**Issue:** Index weights for reranking use hardcoded defaults instead of configuration.
+
+**Location:** `src/Core/Search/SearchService.cs:223`
+
+**Impact:** Cannot tune relevance scoring per index.
+
+**Fix Required:** Load index weights from configuration file.
+
+---
+
 ## Testing Gaps
 
 These bugs were discovered through comprehensive E2E testing. Previous tests only verified:

clean.sh

@@ -13,4 +13,10 @@ rm -rf src/Core/obj
 rm -rf src/Main/bin
 rm -rf src/Main/obj
 
+rm -rf tests/Core.Tests/bin
+rm -rf tests/Core.Tests/obj
 rm -rf tests/Core.Tests/TestResults
+
+rm -rf tests/Main.Tests/bin
+rm -rf tests/Main.Tests/obj
+rm -rf tests/Main.Tests/TestResults

km.sh

@@ -1,2 +1,2 @@
-#!/bin/bash
+#!/usr/bin/env bash
 dotnet run --project src/Main/Main.csproj -- "$@"