chore(cli): remove unused v0.0 scaffolding

Foundation PR-1 reserved several internal packages and helpers as
scaffolding for follow-up PRs that ended up taking different routes.
Audit confirms zero production references; this commit removes them so
the cli/ tree reflects what's actually shipped.

Removed (148 LOC):

  cli/internal/safepaths/                 — `Validate` / `WithinRoot` /
                                            three sentinel errors. Reserved
                                            for `weknora doc upload`'s path
                                            scrubbing; that command landed
                                            in PR-10 using its own
                                            `validateUploadPath` (os.Stat +
                                            regular-file check) — sufficient
                                            for the actual threat model
                                            (local CLI invocations).

  cli/internal/cmdutil/json_flags.go      — `AddJSONFlags` helper +
                                            unused --jq / --template flag
                                            registration. Reserved for PR-3
                                            "lipgloss tables / jq evaluator"
                                            which never materialized; every
                                            command directly registers
                                            BoolVar(&JSONOut, "json", ...)
                                            since v0.0 ship time.

  cmdutil.NewTableExporter                — empty alias for jsonExporter,
                                            reserved for the same PR-3
                                            renderer. Removed; jsonExporter
                                            stays under NewJSONExporter.

  cmdutil.Options marker interface        — empty interface{} reserved as a
                                            convention; no command embeds
                                            or asserts against it.

Stale comments fixed:

  - cmd/root.go: package comment updated kb (list+get) → kb
    (list+view+create+delete) and noted the `get` cobra alias.
  - cmd/root.go: dropped --no-version-check forward-reference (no such flag).
  - cmd/root.go: removed "(PR-7)" attribution from NewRootCmd doc comment.
  - cmd/kb/kb.go: same package-comment update.
  - cmd/chat/chat.go: replaced "PR-7" mention in --help example with a
    generic placeholder so cobra-rendered help is review-clean.
  - cmd/search/search.go: removed "Lipgloss tables arrive in PR-3"
    forward-reference; the inline indent helper is the shipped form.
  - internal/agent/annotations.go: ShouldUseAgentMode → DetectAIAgent
    (removed in PR-12).

AGENTS.md "Known limitations" section added:
  Documents that chat / search / doc upload currently surface server-side
  precondition misses (LLM / vector store / storage engine not configured)
  as `network.error` with `context deadline exceeded`. A planned future
  release will introduce a `precondition.*` typed error namespace
  (server returns HTTP 412 before opening the SSE / streaming response).
  This documents the limitation honestly for reviewers and integrators
  rather than claiming a behavior we don't yet have.

Tests: 27 cli packages pass (safepaths_test was the 28th — gone with the
package). go vet clean.

cli/internal/cmdutil/exporter.go

@@ -6,9 +6,10 @@ import (
 	"github.com/Tencent/WeKnora/cli/internal/format"
 )
 
-// Exporter renders command output. Foundation PR ships a single
-// jsonExporter that writes the envelope; PR-3 lands lipgloss tables, jq,
-// and templates as additional implementations.
+// Exporter renders an envelope to a writer. Currently the only
+// implementation is the JSON exporter; the interface stays in case a future
+// renderer (templated text, table) needs to plug in without changing call
+// sites that already write through Exporter.Write.
 type Exporter interface {
 	Write(w io.Writer, env format.Envelope) error
 }
@@ -22,9 +23,3 @@ type jsonExporter struct{}
 func (jsonExporter) Write(w io.Writer, env format.Envelope) error {
 	return format.WriteEnvelope(w, env)
 }
-
-// NewTableExporter is a foundation-PR alias for the JSON exporter; PR-3
-// replaces it with a lipgloss-based renderer that respects iostreams.IO
-// ColorEnabled. Until then table output looks identical to JSON output so
-// commands work end-to-end either way.
-func NewTableExporter(_ []string) Exporter { return &jsonExporter{} }

cli/internal/cmdutil/exporter_test.go

@@ -20,12 +20,6 @@ func TestJSONExporter_WritesEnvelope(t *testing.T) {
 	assert.Equal(t, true, got["ok"])
 }
 
-func TestTableExporter_PR1AliasesJSON(t *testing.T) {
-	var buf bytes.Buffer
-	require.NoError(t, NewTableExporter([]string{"id"}).Write(&buf, format.Success("x", nil)))
-	assert.Contains(t, buf.String(), `"ok":true`)
-}
-
 func TestFlagError_IsSentinel(t *testing.T) {
 	err := NewFlagError(assert.AnError)
 	_, ok := err.(*FlagError)

cli/internal/cmdutil/json_flags.go

@@ -1,28 +0,0 @@
-package cmdutil
-
-import (
-	"github.com/spf13/cobra"
-)
-
-// AddJSONFlags registers the standard output triplet on cmd:
-//
-//	--json [fields]   JSON envelope output, optional field-projection list
-//	--jq <expr>       embedded jq filter (PR-3 wires the real evaluator)
-//	--template <tmpl> Go text/template (PR-3)
-//
-// The three flags are mutually exclusive at evaluation time; PR-3 enforces it.
-// `fields` is the list of valid field names that --json [fields] may project
-// against; commands pass their resource's field set (kb / doc / chunk / ...).
-//
-// *exporter is initialized to a JSON exporter; PR-3 swaps in jq/template
-// variants based on which flag the user supplied.
-func AddJSONFlags(cmd *cobra.Command, exporter *Exporter, fields []string) {
-	_ = fields // PR-3 uses this for --json field-list completion + validation
-	var jsonOut bool
-	var jqExpr string
-	var tmpl string
-	cmd.Flags().BoolVar(&jsonOut, "json", false, "Output JSON envelope")
-	cmd.Flags().StringVar(&jqExpr, "jq", "", "Filter output via embedded jq expression")
-	cmd.Flags().StringVar(&tmpl, "template", "", "Format output via Go text/template")
-	*exporter = NewJSONExporter()
-}

cli/internal/cmdutil/json_flags_test.go

@@ -1,18 +0,0 @@
-package cmdutil
-
-import (
-	"testing"
-
-	"github.com/spf13/cobra"
-	"github.com/stretchr/testify/assert"
-)
-
-func TestAddJSONFlags_RegistersFlags(t *testing.T) {
-	c := &cobra.Command{Use: "x"}
-	var exp Exporter
-	AddJSONFlags(c, &exp, []string{"id", "name"})
-	assert.NotNil(t, c.Flags().Lookup("json"))
-	assert.NotNil(t, c.Flags().Lookup("jq"))
-	assert.NotNil(t, c.Flags().Lookup("template"))
-	assert.NotNil(t, exp, "exporter must be initialized")
-}

cli/internal/cmdutil/options.go

@@ -6,11 +6,6 @@ import (
 	"github.com/spf13/cobra"
 )
 
-// Options is the marker interface every command's <Verb>Options struct should
-// satisfy. Concrete Options structs (KbListOptions, DocUploadOptions, ...)
-// are declared in their own command file; see CONTRIBUTING.md for the template.
-type Options interface{}
-
 // MustRequireFlag panics on programmer error (typo in flag name). cobra's
 // MarkFlagRequired only returns an error when the named flag does not exist
 // on the command, which means the caller has a typo at registration time —