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nullkey 6d8c8650cd feat(cli): --dry-run + risk metadata + validation parity on 19 mutations
Two intertwined agent safety nets that share the same files:

1. --dry-run flag for offline preview of mutation commands
2. Risk: metadata + SetRisk helper for destructive command surfaces

Coverage (19 mutation commands with --dry-run):
  kb.create/edit/delete           agent.create/edit/delete
  doc.create/upload/fetch/delete  doc.delete_all (special variant)
  session.delete  chunk.delete    profile.add/remove
  auth.refresh/logout             link  unlink
  api.{post,put,patch,delete}     (api.get + --dry-run rejected, exit 2)

Envelope additions (omitempty in non-dry-run paths):
  meta.dry_run: bool        true when --dry-run was used
  meta.plan:    map         {action, args} per the per-command taxonomy

Risk: metadata
--------------
cmdutil.SetRisk(cmd, action) stamps cobra.Annotations with
risk.level=destructive + risk.action=<action> on the 9 destructive
commands. The SetAgentHelp wrapper prepends a "Risk: <action>
(destructive)" line in the default text help path so agents see a clear
warning before parsing Usage. WEKNORA_AGENT_HELP=1 JSON path stays
unchanged — structured agent-help already carries warnings[].

Validation parity with the live path
------------------------------------
Every pure-local validation (flag presence, mutual exclusion, enum
bounds, URL/regex format, ResolveKBLocal for KB resolution that does not
require an SDK call) runs BEFORE the dry-run gate. This matches the
industry-standard "preview shows what live would do" contract:
--dry-run accepts exactly the same invocations the live path accepts and
rejects exactly the same invocations the live path rejects, modulo the
side-effecting work itself.

The side-effecting work (SDK calls, file writes, keyring writes, server-
side name → id resolution) is what --dry-run actually gates. Each
mutation file pairs its RunE validation block with a regression test
under *_dry_run_test.go / dryrun_validation_test.go so future refactors
don't reintroduce the gap.

Helper surface
--------------
- HandleDryRun(cmd, dryRun, plan) extracts the early-return so the
  19 RunE call sites stay 3 lines each.
- EmitDryRun routes through FormatOptions.Emit, inheriting _notice /
  TTY indent / --jq filtering for free.
- ResolveKBLocal mirrors ResolveKB but never calls the SDK; dry-run
  paths use it so the plan reports the raw --kb value (UUID or name)
  without a name → id lookup.

Streaming commands (chat, session ask, session continue-stream) are
deliberately excluded: a buffered plan makes no sense for an event
stream.

Lock semantics in the dry-run path:
  - destructive + --dry-run: exit 0, no exit-10 confirmation prompt
  - --dry-run + -y: byte-identical envelope to --dry-run alone
  - --dry-run + --jq: filter applies to the preview envelope normally
2026-05-28 19:29:50 +08:00
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