feat: add .replicated config file parser and discovery logic

[jdewinne]

Summary

Adds .replicated and .replicated.yaml config file parser and discovery logic to the library, matching the behavior of the replicatedhq/replicated CLI.

Changes

• New src/config.ts

  • ReplicatedConfig, ChartConfig, PreflightConfig, and ReplLintConfig interfaces
  • findAndParseConfig(startPath) — walks upward from startPath toward the filesystem root, collecting all .replicated and .replicated.yaml files along the way (monorepo support). If startPath is a file, parses it directly.
  • parseConfigFile(filePath) — reads, parses YAML, validates, resolves relative paths to absolute (relative to the config file's directory), and returns the config.
  • Monorepo merging — merges discovered configs root → leaf:
    • Scalar fields (appId, appSlug, releaseLabel) are overridden by child configs
    • Channel arrays (promoteToChannelIds, promoteToChannelNames) are replaced if present
    • Resource arrays (charts, manifests, preflights) are appended and deduplicated by resolved absolute path
  • Validation matching the CLI:
    • Non-empty chart.path, preflight.path, and manifests entries
    • Preflight cross-field validation (chartName ↔ chartVersion)
    • Glob syntax validation on paths containing *?[{

• New src/config.test.ts

  • Tests for discovery, fallback to .replicated.yaml, relative path resolution, monorepo merging, deduplication, valid/invalid YAML parsing, validation errors, and repl-lint parsing.

• src/index.ts — exports all new types and functions

• package.json — adds picomatch dependency for glob pattern validation

Testing

• npm run build ✅
• npm test — 87 passed, 0 failed ✅
• npm run prettier ✅