instructions/CONTRACT.md: Skill-H1, Referenztiefe und Begruendungsprosa praezisiert (schliesst #71, #72, #79)

Files changed:
- CHANGES.md
- VERSION
- instructions/CONTRACT.md
- instructions/wiki-ingest/SKILL.md

instructions/wiki-ingest/SKILL.md

@@ -24,13 +24,10 @@ pages should never have cost the concept contract. Field-level requirements alwa
    two capture flags are not: `raw accept` refuses without them.
 
    **Ask the user for `--fidelity` and `--authority` before this call, rather than guessing from
-   a quick look at the file.** This is the one place in the whole skill where the asymmetry from
-   `source_type` (step 6 below) does not hold: a wrong `source_type` sits in a visible,
-   correctable catalog slot (`unclassified`), but a guessed capture value is not "unknown" - it
-   is a claim about the capture that cannot be corrected later, because the knowledge exists only
-   at this drop point. If it is genuinely unclear how faithful the capture is or what the
-   material may claim about its subject, say so to the user and ask directly - do not fall back
-   to a plausible-looking default.
+   a quick look at the file.** A guessed capture value is not "unknown": it is a claim about the
+   capture that nothing later can correct, because the knowledge exists only at this drop point.
+   Genuinely unclear how faithful the capture is, or what the material may claim about its
+   subject? Say so and ask - there is no plausible-looking default to fall back on.
 
    ```bash
    tools/wikitool raw accept --fidelity <value> --authority <value> \
@@ -79,7 +76,8 @@ pages should never have cost the concept contract. Field-level requirements alwa
    which entities/concepts to create or update, any specific emphasis.
 
 6. **Create the source page.** Read
-   [kb/sources/COLLECTION.md](../../kb/sources/COLLECTION.md) first.
+   [kb/sources/COLLECTION.md](../../kb/sources/COLLECTION.md) first - it holds what this
+   instance expects of a source page's sections and how it names one.
 
    ```bash
    tools/wikitool new source --name "<Title>" \
@@ -99,12 +97,12 @@ pages should never have cost the concept contract. Field-level requirements alwa
    it later without moving or renaming the page.
 
    `fidelity` and `authority` have no default either, and `new source` refuses without them the
-   same way (Gitea #67) - but unlike `source_type` there is no catalog slot to fall back on. If
-   step 1 already ran `raw accept` without `--page`, its success message printed the exact
-   `--set fidelity=... --set authority=...` pair to reuse here verbatim; if it did not (the file
-   was already in `raw/`), ask the user the same question step 1 asks before promoting, rather
-   than inferring an answer from the file's content now. Never pass `unknown` here - that value
-   is backfill-only, written only by `wikitool touch` on a page predating this rule.
+   same way (Gitea #67) - but here there is no catalog slot to fall back on, for the reason step
+   1 gives. If step 1 already ran `raw accept` without `--page`, its success message printed the
+   exact `--set fidelity=... --set authority=...` pair to reuse here verbatim; if it did not (the
+   file was already in `raw/`), ask the user, rather than inferring an answer from the file's
+   content now. Never pass `unknown` here - that value is backfill-only, written only by
+   `wikitool touch` on a page predating this rule.
 
    List **every** raw file this ingest covers - a folder of related documents becomes one
    source page with all its files in `raw_files:`, not one page per file. For an external