add changes for 0.7.1

Author: jamierpond

CHANGES.md

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+# 0.7.1
+
+## 1. JSON Path Array Indexing (`context.go`)
+
+**What:** Adds array index syntax to variable resolution.
+
+```
+{{steps.api.tracks[0].name}}  ← now works
+```
+
+**How:** Regex parses `key[index]` segments, accesses map then array. `jsonPathLookup` now delegates to `jsonPathLookupRaw` (no more duplicated logic).
+
+---
+
+## 2. File Discovery (`tui.go`)
+
+**What:** Changed from "git-tracked files" → "non-gitignored files".
+
+**Impact:**
+- Untracked `.yapi` files now discovered (previously invisible until committed)
+- Properly recurses into submodules
+
+**How:** Replaced git index scan with `filepath.Walk` + gitignore pattern matching.
+
+---
+
+## Breaking Changes
+
+None expected. New files may appear in selection that weren't visible before.