Feature/json proc parser

[7schmiede]

Summary

Introduces the alpha JSON stored procedure parser and unifies stored procedure metadata under ResultSets (legacy root-level Output removed). Adds documentation, migration notes, and refines versioning to rely solely on MinVer (no <Version> property).

Key Changes

Added / Enhanced

• Alpha JSON parser: heuristics detect first JSON result set (suffix like *AsJson is optional; treated only as a hint).
• Dual method generation for JSON procedures: raw (<ProcName>Async) + typed (<ProcName>DeserializeAsync).
• Deterministic JSON column typing via UDTT + provenance pipeline.
• README overhaul (cleaned encoding artifacts, clearer feature list, migration note).
• Documentation page updated: docs/content/3.reference/json-procedures.md (branch-specific note removed).
• AI guidelines updated (MinVer-only versioning, clarified deprecation stance).

Breaking

• Removal of root-level Output metadata: tooling must read ResultSets[0].
• Internal rename StoredProcdure → StoredProcedure (only affects internal symbol consumers).

Tooling / Infra

• Switched to tag-driven versioning only (MinVer); removed static <Version> from .csproj.
• Clarified exit codes & testing strategy in README.
• Unified wording around snapshot-only architecture and cache behaviors.

Migration

If prior automation consumed Output:

var rs0 = snapshot.StoredProcedures[procName].ResultSets[0];
foreach (var col in rs0.Columns) { /* ... */ }