Add AGENTS.md and bump to Go 1.25

AGENTS.md

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+# AGENTS
+
+- Go 1.25; modules in `go.mod`; binary name `statusline`.
+- Build: `task build` (stripped) or `go build -o bin/statusline .`.
+- Run fixture: `task run` or `cat test/fixture.json | ./bin/statusline`.
+- Tests: `task test` (`go test -v ./...`); single test: `go test -v -run 'TestName' ./...`.
+- Coverage: `task test:cover`; benchmarks: `task bench` or `task bench:go`.
+- Lint: `task lint` (`golangci-lint run`); auto-fix: `task lint:fix`.
+- Formatting: `gofumpt` + `goimports` via golangci-lint; keep `go fmt`/gofumpt style.
+- Imports: organize with `goimports`; stdlib first, then third-party, then local.
+- Types: prefer explicit types; avoid unused code (lint-enforced).
+- Naming: follow Go conventions (ExportedCamelCase for exported, lowerCamelCase for unexported); no stutter.
+- Errors: check and return errors; wrap or format with context; no silent ignores.
+- Security: `gosec` enabled; avoid leaking secrets; handle paths carefully.
+- Tests should avoid external deps; skip when environment-dependent.
+- Modernization helpers: `task modernize` / `task modernize:test` (gopls).
+- Clean artifacts: `task clean`; binary lives in `bin/`.
+- Git info and gitea checks rely on `go-git` and `gopsutil`; keep deps updated via `go mod tidy`.
+- Keep ANSI handling via `stripANSI` regex in `main.go`; adjust carefully if changing.
+- No Cursor/Copilot rules present as of this file.
+- No emojis in code or docs unless explicitly requested.