Slice 2: config package + jotsmith config show

[MaxAnderson95]

What to build

Implement the internal/config package and the jotsmith config show command. Every later subcommand depends on a loaded, validated config, so this slice nails down the file format, path-resolution precedence, env-var contract, and error surface.

Path resolution precedence (highest wins): --config flag → JOTSMITH_CONFIG env → ${XDG_CONFIG_HOME:-$HOME/.config}/jotsmith/config.json.

Acceptance criteria

• internal/config defines a Config struct matching the PRD §5.3 schema: version, subscription_id, storage_account, key_vault, key_name, issuer, jwks_path, discovery_path
• Load(path) reads, JSON-unmarshals, and validates required fields; returns distinct typed errors for missing file, invalid JSON, and missing/invalid required field
• Validation error messages name the offending field
• version is required and validated (only 1 is accepted in this slice)
• issuer validation: parses as URL, has scheme + host, no trailing slash; default-corrected if a trailing slash is present and a debug log is emitted
• jotsmith config show prints the loaded config JSON pretty-printed to stdout
• jotsmith config show --path prints the resolved config file path to stdout
• Config-load errors exit with code 2 and render to stderr
• --no-color is respected on stderr error rendering
• Unit tests cover: XDG fallback when env unset, env override of XDG, flag override of env, missing file, invalid JSON, missing required field, trailing-slash issuer correction

Blocked by

• Slice 1: Repo scaffolding (Go module, urfave/cli v3 root, global flags, CI, goreleaser) #1 — Repo scaffolding

Originally created in OpenCode session ID: ses_17ca8efd8ffexLcFSysAMDVNBQ

[MaxAnderson95]

Implemented and merged in #14.

Originally created in OpenCode session ID: ses_17c986ef9ffeHc0S3r1wQcmLDT