iter docs-honesty-lint.1: canonical docs present-tense-honest + wrap-robust pin + Sweep 5

Strips Wunschdenken (forward intent stated as fact) and non-citation
post-mortem / doc-archaeology from docs/DESIGN.md (14 corrections incl.
1 Step-14 procedural-catch-all site the spec's illustrative regex would
have missed) + docs/PROSE_ROUNDTRIP.md; genuine forward intent (LLM
tool-use / MCP / LSP) relocated to roadmap P3. Codifies the
tense+modality discriminator as a present-tense DESIGN.md meta-
subsection. Guards two ways: wrap-robust enumerated absent/present pin
(crates/ailang-core/tests/docs_honesty_pin.rs, norm() whitespace-
collapse helper — structurally discharges the recurring grep/contains
line-wrap failure family) + wrap-robust advisory Sweep 5 in
architect_sweeps.sh (contiguous-fragment regex) with full sweep-count
lockstep + new ailang-architect.md "DESIGN.md honesty drift" bullet.
KEEPs preserved (Diverge-reserved, regions-rejected, self-labelled
tiebreaker). No language/checker/codegen/runtime change — sole crates/
change is the additive pin; ail check/run/build byte-unchanged.
Workspace 609/0 (delta +4 pin), sentinel trio green, build clean.

docs/roadmap.md

@@ -651,3 +651,12 @@ work progresses.
 - [ ] **\[idea\]** Richer integration paths between RC and
   uniqueness — deferred from the 21' arc; revisit once the
   uniqueness inference covers more program shapes.
+- [ ] **\[idea\]** LLM tool-use schema / MCP server / LSP front-end
+  over the prose-roundtrip cycle — additive layers on top of the
+  static-prompt `ail merge-prose | client | ail parse | ail check`
+  path (LLM calls back into `ail parse`/`ail check` mid-turn; an
+  MCP-compatible client discovers AILang's resources/tools/prompts).
+  Relocated here from DESIGN.md §"prose roundtrip" + PROSE_ROUNDTRIP.md
+  by the docs-honesty-lint milestone (forward intent does not live in
+  the canonical docs).
+  - context: `docs/specs/2026-05-18-docs-honesty-lint.md`