chore: add pre-commit hooks and secrets baseline (#1)

## Summary
- Adds `.pre-commit-config.yaml` with trailing-whitespace,
end-of-file-fixer, large file check, merge conflict check, private key
detection, mixed line ending fix (LF), and detect-secrets hooks
- Generates clean `.secrets.baseline` (no secrets detected in repo)

## Hooks included
| Source | Hooks |
|--------|-------|
| `pre-commit-hooks` v5.0.0 | trailing-whitespace, end-of-file-fixer,
check-added-large-files, check-merge-conflict, detect-private-key,
mixed-line-ending |
| `detect-secrets` v1.5.0 | detect-secrets (with baseline) |

## Test plan
- [ ] Run `pre-commit run --all-files` to verify all hooks pass
- [ ] Confirm `.secrets.baseline` has no flagged results

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

## Release Notes

* **Chores**
* Added automated pre-commit checks to enforce code quality standards
including whitespace consistency, file endings, and line ending
normalization
  * Enabled detection of merge conflicts and private keys during commits
* Configured secret detection baseline to prevent accidental sensitive
information in repository

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: bakerboy448

.pre-commit-config.yaml

@@ -0,0 +1,24 @@
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v6.0.0
+    hooks:
+      - id: trailing-whitespace
+        name: trim trailing whitespace
+      - id: end-of-file-fixer
+        name: fix end of files
+      - id: check-added-large-files
+        name: check for added large files
+      - id: check-merge-conflict
+        name: check for merge conflicts
+      - id: detect-private-key
+        name: detect private key
+      - id: mixed-line-ending
+        name: mixed line ending
+        args: ['--fix=lf']
+
+  - repo: https://github.com/Yelp/detect-secrets
+    rev: v1.5.0
+    hooks:
+      - id: detect-secrets
+        name: detect secrets
+        args: ['--baseline', '.secrets.baseline']

.secrets.baseline

@@ -0,0 +1,127 @@
+{
+  "version": "1.5.0",
+  "plugins_used": [
+    {
+      "name": "ArtifactoryDetector"
+    },
+    {
+      "name": "AWSKeyDetector"
+    },
+    {
+      "name": "AzureStorageKeyDetector"
+    },
+    {
+      "name": "Base64HighEntropyString",
+      "limit": 4.5
+    },
+    {
+      "name": "BasicAuthDetector"
+    },
+    {
+      "name": "CloudantDetector"
+    },
+    {
+      "name": "DiscordBotTokenDetector"
+    },
+    {
+      "name": "GitHubTokenDetector"
+    },
+    {
+      "name": "GitLabTokenDetector"
+    },
+    {
+      "name": "HexHighEntropyString",
+      "limit": 3.0
+    },
+    {
+      "name": "IbmCloudIamDetector"
+    },
+    {
+      "name": "IbmCosHmacDetector"
+    },
+    {
+      "name": "IPPublicDetector"
+    },
+    {
+      "name": "JwtTokenDetector"
+    },
+    {
+      "name": "KeywordDetector",
+      "keyword_exclude": ""
+    },
+    {
+      "name": "MailchimpDetector"
+    },
+    {
+      "name": "NpmDetector"
+    },
+    {
+      "name": "OpenAIDetector"
+    },
+    {
+      "name": "PrivateKeyDetector"
+    },
+    {
+      "name": "PypiTokenDetector"
+    },
+    {
+      "name": "SendGridDetector"
+    },
+    {
+      "name": "SlackDetector"
+    },
+    {
+      "name": "SoftlayerDetector"
+    },
+    {
+      "name": "SquareOAuthDetector"
+    },
+    {
+      "name": "StripeDetector"
+    },
+    {
+      "name": "TelegramBotTokenDetector"
+    },
+    {
+      "name": "TwilioKeyDetector"
+    }
+  ],
+  "filters_used": [
+    {
+      "path": "detect_secrets.filters.allowlist.is_line_allowlisted"
+    },
+    {
+      "path": "detect_secrets.filters.common.is_ignored_due_to_verification_policies",
+      "min_level": 2
+    },
+    {
+      "path": "detect_secrets.filters.heuristic.is_indirect_reference"
+    },
+    {
+      "path": "detect_secrets.filters.heuristic.is_likely_id_string"
+    },
+    {
+      "path": "detect_secrets.filters.heuristic.is_lock_file"
+    },
+    {
+      "path": "detect_secrets.filters.heuristic.is_not_alphanumeric_string"
+    },
+    {
+      "path": "detect_secrets.filters.heuristic.is_potential_uuid"
+    },
+    {
+      "path": "detect_secrets.filters.heuristic.is_prefixed_with_dollar_sign"
+    },
+    {
+      "path": "detect_secrets.filters.heuristic.is_sequential_string"
+    },
+    {
+      "path": "detect_secrets.filters.heuristic.is_swagger_file"
+    },
+    {
+      "path": "detect_secrets.filters.heuristic.is_templated_secret"
+    }
+  ],
+  "results": {},
+  "generated_at": "2026-03-07T02:18:31Z"
+}