feat(#1190): wire --converge primary surface into /gsd:progress --next (ADR-15) (#1237)

* feat(#1190): wire --converge primary surface into /gsd:progress --next (ADR-15)

ADR-15 designates /gsd-progress --next --auto --converge as the PRIMARY plan-convergence surface, but only the secondary surface (autonomous.md) was wired. next.md now parses --converge/--cross-ai into a plan strategy, gates on workflow.plan_review_convergence, forwards reviewer flags + --max-cycles, and routes Route-3 planning through /gsd:plan-review-convergence (mirroring autonomous.md); --auto chaining preserves converge mode. Adds argument-hint + help/full.md + COMMANDS.md + how-to parity and a structural regression test.

Closes #1190

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* chore(#1190): add changeset for progress --converge surface (#1237)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* fix(#1190): keep progress --converge docs skill-dep-clean + regen workflow size baseline

CI surfaced two ripples from the ADR-15 workflow edits: (1) lint-skill-deps + profile-closure flagged /gsd:plan-phase and /gsd:plan-review-convergence SlashCommand tokens in progress.md's flag docs as undeclared deps — reworded to plain prose since progress.md only advertises the flag (the real invocation lives in next.md); (2) the per-file workflow size baseline needed regenerating after the next.md/help edits.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

gsd-core/workflows/help/modes/full.md

@@ -256,11 +256,15 @@ Check project status and intelligently route to next action.
 Modes:
 - **default** — progress report + intelligent routing
 - **`--next`** — auto-advance to the next logical step (use `--next --force` to bypass safety gates)
+- **`--next --auto`** — like `--next`, but chains steps automatically until milestone completion or a blocking decision
+- **`--next --converge`** — when the next action is planning, route it through `/gsd:plan-review-convergence` instead of `/gsd:plan-phase`; requires `workflow.plan_review_convergence=true`. `--cross-ai` is an alias. Reviewer flags (`--codex`, `--gemini`, `--claude`, `--opencode`, `--ollama`, `--lm-studio`, `--llama-cpp`, `--all`) and `--max-cycles N` forward to the convergence loop.
 - **`--forensic`** — append a 6-check integrity audit after the progress report
 - **`--do "<text>"`** — smart router: dispatch freeform intent to the matching `/gsd-*` command (see *Smart Router* above)
 
 Usage: `/gsd:progress`
 Usage: `/gsd:progress --next`
+Usage: `/gsd:progress --next --auto`
+Usage: `/gsd:progress --next --auto --converge`
 Usage: `/gsd:progress --forensic`
 
 ### Session Management