v1.13.16-xml-parser: Anthropic <invoke> support + unknown-tool recovery hints

Two-part fix for the model-emitted XML drift the v1.13.15-codecontext-synth
investigation surfaced (1 raw <invoke> leak observed out of 190 qwen3.6
turns — qwen3.6-35b-a3b-mxfp4 drifts to the Anthropic format when prompted
as an Architect-style agent because Claude Code documentation in its
pre-training corpus uses that shape).

## Parser extension

xml-parser.ts now recognizes BOTH XML tool-call flavors:

  - Qwen/Hermes:   <tool_call><function=NAME>...<parameter=K>V</parameter>...</function></tool_call>
  - Anthropic:     <invoke name="NAME"><parameter name="K">V</parameter></invoke>

Both route through the same synthetic-id xml_call_${idx} ToolCall path.
extractToolCallBlocks() and partialXmlOpenerStart() handle both openers
(<tool_call> and <invoke...) so partial buffers don't get prematurely
flushed during streaming.

The existing Qwen parser was tightened to tolerate whitespace around `=`
(<function = name>, <parameter = key>...) so a stray space doesn't get
absorbed into the function name. Name capture is non-whitespace,
non-`>`.

## Unknown-tool recovery hint

New tool-suggestions.ts exports levenshtein() + suggestToolName() +
formatUnknownToolError(). When tool-phase.ts:executeToolCall receives a
toolCall.name that isn't in TOOLS_BY_NAME, the error returned to the
model now includes a "Did you mean: X?" hint based on Levenshtein
distance ≤3 or substring match against Object.keys(TOOLS_BY_NAME).
Targets the qwen3.6 drift to read_file → suggest view_file. Applies to
all unknown tool names, not just <invoke>-derived ones — at the
dispatch layer we no longer know which format produced the call, and
the extra signal is harmless for Qwen-derived calls.

## Test coverage

xml-parser.test.ts: 46 tests, all green. Covers both parsers
(well-formed, malformed, multi-parameter, nested-content), the
partial-opener detector for both flavors, the unified extraction
helper, and the unknown-tool error formatter.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

boocode_roadmap.md

@@ -92,6 +92,7 @@ All v1.13.x batches were retagged to the `vMAJOR.MINOR.PATCH-slug` scheme on 202
 - `v1.13.13-ws-publish` — all ~80 publish sites converted to the typed wrappers; every WS frame now Zod-validated at boundary
 - `v1.13.14-skills-audit` — 26 skills vendored + audited via 5 parallel agent teams; 14 kept, 11 dropped, 1 migrated to BOOCHAT.md/BOOCODER.md
 - `v1.13.15-codecontext-synth` — forced second-inference synthesis pass for codecontext overview tools (truncation-aware extraction; auto-fetched top-N files + project docs; 32k payload-budget contract preserved)
+- `v1.13.16-xml-parser` — Anthropic `<invoke>` parser support + Levenshtein-based unknown-tool recovery hints (qwen3.6 drift to Claude Code-style tool names like `read_file`); xml-parser test coverage
 
 The remaining strangler-fig final step (drop `messages.tool_calls` + `tool_results` columns) is still pending under its old `v1.13.2` working name; will get a new tag slug when scoped.
 
@@ -611,7 +612,7 @@ Earlier May 18 chat recommended Option A (thin orchestration shell over OpenCode
 
 ### v1.13.x cleanup line locked (2026-05-22)
 
-After the 2026-05-22 retag, the v1.13.x cleanup line in `vMAJOR.MINOR.PATCH-slug` form is **v1.13.0-ai-sdk-v6 ✅ → v1.13.1-cleanup-bundle ✅ → v1.13.2-compaction-prune ✅ → v1.13.3-truncate ✅ → v1.13.4-reasoning-fix ✅ → v1.13.5-stability-bundle ✅ → v1.13.6-prefix-stability ✅ → v1.13.7-compaction-trigger ✅ → v1.13.8-tool-cost ✅ → v1.13.9-agentlint ✅ → v1.13.10-openspec ✅ → v1.13.11-tools ✅ → v1.13.12-ws-schemas ✅ → v1.13.13-ws-publish ✅ → v1.13.14-skills-audit ✅ → v1.13.15-codecontext-synth ✅ → column drop (final, pending — old working name v1.13.2)**. **Do not fold.** Smoke isolation matters: each batch has a distinct rollback surface, and bisecting a 750-LoC merge across four unrelated changes is worse than four separate dispatches.
+After the 2026-05-22 retag, the v1.13.x cleanup line in `vMAJOR.MINOR.PATCH-slug` form is **v1.13.0-ai-sdk-v6 ✅ → v1.13.1-cleanup-bundle ✅ → v1.13.2-compaction-prune ✅ → v1.13.3-truncate ✅ → v1.13.4-reasoning-fix ✅ → v1.13.5-stability-bundle ✅ → v1.13.6-prefix-stability ✅ → v1.13.7-compaction-trigger ✅ → v1.13.8-tool-cost ✅ → v1.13.9-agentlint ✅ → v1.13.10-openspec ✅ → v1.13.11-tools ✅ → v1.13.12-ws-schemas ✅ → v1.13.13-ws-publish ✅ → v1.13.14-skills-audit ✅ → v1.13.15-codecontext-synth ✅ → v1.13.16-xml-parser ✅ → column drop (final, pending — old working name v1.13.2)**. **Do not fold.** Smoke isolation matters: each batch has a distinct rollback surface, and bisecting a 750-LoC merge across four unrelated changes is worse than four separate dispatches.
 
 ### v1.13 retrospective (what shipped)