Add pre-commit hooks for code quality (#19)

## Summary
- Add pre-commit framework with hooks for YAML, Ansible, Python, shell, TOML, JSON, and secret detection
- Fix all 91+ ansible-lint violations (variable naming, handler capitalization, changed_when)
- Fix shellcheck warnings in mise-tasks scripts
- Document pre-commit setup in README.md

## Deployment and Testing
- [x] All pre-commit hooks pass (`uvx pre-commit run --all-files`)
- [x] Test ansible playbook with `--check` mode
- [x] Run `mise run indri-services-check` after deploy

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Reviewed-on: https://forge.tail8d86e.ts.net/eblume/blumeops/pulls/19

pulumi/Pulumi.tail8d86e.yaml

@@ -1,2 +1,3 @@
+---
 config:
   tailscale:tailnet: tail8d86e.ts.net

pulumi/Pulumi.yaml

@@ -1,3 +1,4 @@
+---
 name: blumeops-tailnet
 runtime:
   name: python

pulumi/pyproject.toml

@@ -2,7 +2,4 @@
 name = "blumeops-tailnet"
 version = "0.1.0"
 requires-python = ">=3.11"
-dependencies = [
-    "pulumi>=3.0.0",
-    "pulumi-tailscale>=0.24.0",
-]
+dependencies = ["pulumi>=3.0.0", "pulumi-tailscale>=0.24.0"]