chore: pre-article polish — visuals, changelog, and install fix

[nvandessel]

Summary

Pre-publication polish for the upcoming article. Addresses findings from a 6-agent parallel audit.

• README: Add graph screenshot, learning loop ASCII diagram, release badge, reframe Project Status from "early alpha" to emphasizing stability and self-dogfooding
• CHANGELOG: Add v0.3.0 section (was missing entirely — jumped from Unreleased to 0.2.0), fix comparison links
• go.mod: Relax go 1.25.7 → go 1.25 so go install works for users on 1.25.0-1.25.6
• SECURITY.md: Update supported versions from 0.1.x to 0.2.x/0.3.x
• CLI_REFERENCE.md: Update version from 0.2.0-dev to 0.3.0

Also performed GitHub cleanup (separate from this PR):

• Converted PRs feat: replace shell hook scripts with native Go subcommands (#79) #104, test: add seed selection, inhibition, and creation gate sim tests #105, feat: implement local LLM client with yzma (purego) #60 to draft (failing CI / merge conflicts / stale)
• Deleted 3 orphan remote branches (claude/*, 4 others already gone)

Test plan

• go build ./cmd/floop passes
• go test ./... — all 29 packages pass
• Verify README renders correctly on GitHub (graph image, badges, ASCII diagram)

🤖 Generated with Claude Code

[greptile-apps]

Greptile Summary

Pre-publication polish addressing version documentation gaps and installation compatibility. The changes add missing v0.3.0 changelog entry, relax the Go version constraint to fix go install for patch versions, update security support matrix, and enhance README with visual aids (graph screenshot, ASCII diagram) and improved project status messaging that emphasizes stability and real-world usage.

Confidence Score: 5/5

• This PR is safe to merge with no risk
• All changes are documentation and metadata updates with no code modifications. The go.mod change is a standard relaxation that increases compatibility. All changes align with the stated pre-publication polish goal.
• No files require special attention

Important Files Changed

Filename	Overview
go.mod	Relaxed Go version from 1.25.7 to 1.25 to fix go install compatibility for users on 1.25.0-1.25.6
CHANGELOG.md	Added missing v0.3.0 section with features/fixes and corrected comparison links
README.md	Added release badge, ASCII learning loop diagram, graph visualization screenshot, and reframed project status to emphasize stability
SECURITY.md	Updated supported versions to 0.2.x/0.3.x (was 0.1.x)
docs/CLI_REFERENCE.md	Updated version from 0.2.0-dev to 0.3.0

_{Last reviewed commit: 22ae204}

[greptile-apps]

_{5 files reviewed, no comments}

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