Add agentpr and watchpr CLI tools

agentpr manages PRs/comments/whoami as unkin-agent (Vault AppRole -> gitea creds
-> Gitea API), fixing tea's post-as-Ben default. watchpr polls PRs and alerts
only on merge/close, human comment, CI failure, or lost mergeability.

- cobra multi-binary layout mirroring node-lookup (cmd/ + internal/)
- Makefile (build, patch|minor|major, completions, rpm), nfpm RPM with both
  binaries + bash/zsh/fish completions, woodpecker CI publishing to rpm-internal
- unit tests for parsing, meaningful-change detection, and the Vault+Gitea client

Makefile

@@ -0,0 +1,79 @@
+# All shipped binaries and the package path each is built from. Both tools live
+# under cmd/; the module root ships no binary of its own.
+BINARIES := agentpr watchpr
+DIST    := dist
+VERSION := $(shell git describe --tags --always --dirty 2>/dev/null || echo dev)
+GOFLAGS := -ldflags="-s -w -X main.version=$(VERSION)"
+OS      ?= $(shell go env GOOS)
+ARCH    ?= $(shell go env GOARCH)
+
+# The Go package path for a binary. Both tools live under cmd/. Usable inside a
+# shell for-loop over $(BINARIES).
+pkgpath  = ./cmd/$$b
+
+.PHONY: all build test lint fmt clean install completions rpm rpm-package patch minor major _tag
+
+all: build
+
+# Build every binary into dist/ so the nfpm packaging step
+# (scripts/build-rpm.sh) can find them. Each main package needs its own -o, so
+# they are built individually rather than with a single ./... invocation.
+build:
+	@for b in $(BINARIES); do \
+		echo "building $$b"; \
+		CGO_ENABLED=0 GOOS=$(OS) GOARCH=$(ARCH) go build $(GOFLAGS) -o $(DIST)/$$b $(pkgpath) || exit 1; \
+	done
+
+test:
+	go test -v -race ./...
+
+lint:
+	golangci-lint run ./...
+
+fmt:
+	gofmt -w .
+
+clean:
+	rm -rf $(DIST) $(BINARIES)
+
+install:
+	go install $(GOFLAGS) ./...
+
+# Generate bash/zsh/fish completions for every binary into dist/completions.
+completions: build
+	@mkdir -p $(DIST)/completions
+	@for b in $(BINARIES); do \
+		$(DIST)/$$b completion bash > $(DIST)/completions/$$b.bash; \
+		$(DIST)/$$b completion zsh  > $(DIST)/completions/_$$b; \
+		$(DIST)/$$b completion fish > $(DIST)/completions/$$b.fish; \
+	done
+
+# Build the binaries then package them (with completions) into an RPM via nfpm.
+rpm: build rpm-package
+
+# Package already-built binaries into an RPM (used by CI after the build step).
+rpm-package:
+	./scripts/build-rpm.sh $(VERSION)
+
+# Bump helpers — reads the latest semver tag and creates the next one.
+# If no tag exists yet, starts from v0.0.0.
+_LATEST := $(shell git tag --sort=-v:refname | grep -E '^v[0-9]+\.[0-9]+\.[0-9]+$$' | head -1)
+_BASE   := $(if $(_LATEST),$(_LATEST),v0.0.0)
+_MAJ    := $(shell echo $(_BASE) | sed 's/^v//' | cut -d. -f1)
+_MIN    := $(shell echo $(_BASE) | sed 's/^v//' | cut -d. -f2)
+_PAT    := $(shell echo $(_BASE) | sed 's/^v//' | cut -d. -f3)
+
+patch:
+	@NEW=v$(_MAJ).$(_MIN).$(shell expr $(_PAT) + 1); \
+	git tag $$NEW && echo "Tagged $$NEW" && $(MAKE) _tag TAG=$$NEW
+
+minor:
+	@NEW=v$(_MAJ).$(shell expr $(_MIN) + 1).0; \
+	git tag $$NEW && echo "Tagged $$NEW" && $(MAKE) _tag TAG=$$NEW
+
+major:
+	@NEW=v$(shell expr $(_MAJ) + 1).0.0; \
+	git tag $$NEW && echo "Tagged $$NEW" && $(MAKE) _tag TAG=$$NEW
+
+_tag:
+	git push origin $(TAG)