chore: update session plan with test tasks

Author: Patel230

SESSION_PLAN.md

@@ -1,10 +1,21 @@
 ## Session Plan
 
-Session Title: General self-improvement
+Session Title: Add missing unit tests for untested utility functions
 
-### Task 1: Self-assessment and improvement
-Files: cmd/iterate/, internal/evolution/
-Description: Read the source code, find one thing to improve (a bug, missing test, or UX gap), implement it, test it, and commit it.
+### Task 1: Add tests for selector formatting functions
+Files: internal/ui/selector/selector_formatting_test.go (new)
+Description: Add unit tests for formatTokenCount, formatContextWindow, formatCostUSD, and formatGitStatus in selector.go. These are pure functions with no tests currently. Test edge cases: zero values, large numbers, boundary percentages (0%, 75%, 90%+), USD formatting thresholds.
+Issue: none
+
+### Task 2: Add tests for utility.go pure functions
+Files: internal/commands/utility_helpers_test.go (new)
+Description: Add unit tests for compactMessages, htmlEscape, highlightCodeBlocks, and formatTokenCount in internal/commands/utility.go. compactMessages has no dedicated tests; htmlEscape and highlightCodeBlocks are only used in the export HTML flow and have no tests. Test: HTML entity escaping, code block wrapping with/without language tags, unclosed code blocks, compaction with and without pins.
+Issue: none
+
+### Task 3: Add tests for features.go utility functions
+Files: cmd/iterate/features_helpers_test.go (new)
+Description: Add unit tests for contextStats, compactHard, formatPinnedMessages, and initProject in cmd/iterate/features.go. These are pure functions with no tests. Test: context stats calculation with various message counts, compaction edge cases (keepLast > len, keepLast == 0), pinned message formatting with long content, initProject idempotency (skips existing files).
 Issue: none
 
 ### Issue Responses
+- none: Build/test/vet all pass. No actual TODOs/FIXMEs/panics in production code. Focus on adding tests for untested pure functions across three packages.