feat: add .af line comments

[Peyton-Spencer]

Summary

• Adds first-class single-# line comment tokens for .af files.
• Preserves comments through formatting and LSP semantic highlighting, while stripping them before AST/codegen output.
• Keeps Markdown ## headings rendered as normal prompt text to avoid breaking existing templates.

Tests

• go test ./...

Closes #79 for the comments slice of Phase 1.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: e55bb6fb-11c1-4e23-a27c-4fcf480ca20f

📥 Commits

Reviewing files that changed from the base of the PR and between 16ffd2a and f6f75d4.

⛔ Files ignored due to path filters (2)

• pkg/gen/gogen/testdata/comments_strip/input.golden.af is excluded by !**/gen/**
• pkg/gen/gogen/testdata/comments_strip/output.golden.go is excluded by !**/gen/**

📒 Files selected for processing (9)

• README.md
• pkg/format/format_test.go
• pkg/lsp/granular_tokens.go
• pkg/token/coarse/coarse.go
• pkg/token/coarse/coarse_test.go
• pkg/token/kind/kind.go
• pkg/token/kind/kind_string.go
• pkg/token/token.go
• pkg/token/token_test.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat-af-comments

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[Peyton-Spencer]

Reviewed the tokenizer, coarse-token conversion, formatter, LSP semantic token handling, and codegen golden coverage for the new single-# comment behavior.

No blocking findings. The implementation keeps comments as granular tokens for formatting/LSP, strips them before AST/codegen, and preserves the documented Markdown heading exceptions.

Verification:

• go test ./... initially failed because the container could not write to the default Go module cache under /home/bun/go/pkg/mod.
• GOMODCACHE=/tmp/opencode/gomodcache GOPATH=/tmp/opencode/gopath go test ./... passed.