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/PROSE_ROUNDTRIP.md

@@ -149,9 +149,5 @@ prefer; `ail merge-prose` composes the prompt and gets out of the
 way. The Unix-pipe shape (`ail merge-prose ... | client | ail parse |
 ail check`) makes the cycle scriptable without lock-in to one vendor.
 
-A future iter may layer a tool-use schema (LLM calls back into
-`ail parse` / `ail check` from inside its turn) or an MCP server
-(any MCP-compatible client discovers AILang's resources, tools, and
-prompts) on top of this cycle. Both are additive — the static-prompt
-fallback documented here remains the lowest-common-denominator path
-that always works.
+The static-prompt path documented here is the lowest-common-denominator
+cycle and always works with any client.