ADR trim: ADRs hold decisions, not details #182

What

Trim every ADR to its decision, context, trade-offs, consequences and reversal triggers, and move
details (step order, constants, timeouts, class names, platform tables, dated evidence) to the
canon that owns them. The test for each sentence: would changing it reopen the decision? If not, it
is a detail.

1. ADR-0025 to ADR-0032. Re-audit against current master, give every detail without a canon
   home one first, then trim. Known stale statements:
   • ADR-0026:22-24 calls its interop "the first platform interop in the shipped SDK" that "binds
     one function of the C library";
   • ADR-0028:84 says a related print is "tracked separately (issue Response envelopes print the raw error body in ToString #100)", and Response envelopes print the raw error body in ToString #100 is closed;
   • ADR-0032 carries Windows divergence rows, while ADR-0031 puts divergence lists in canon.
2. ADR-0001 to ADR-0023. Audit the same way, then trim. Known items:
   • ADR-0001:31-32 still plans .NET 11 ReadAllLinesAsync and KillOnParentExit as light-up,
     which ADR-0032's Target frameworks section contradicts;
   • ADR-0008:34-35 says the transport-owned fingerprint hashes "transitive schemas", while
     tools/OpenCode.Sdk.Tools/Generator/Binding/TransportOwnedFingerprint.cs:17-22 identifies
     referenced components by name only;
   • ADR-0021's Date: against its revised Scope section (documentation.md:49 defines what the
     date means).

Also write the process-primitive order (the BCL first, then a faithful Polyfill backport, then the
SDK's own code) into canon; today only ADR-0032 applies it (:59-61).

Why in 1.0

The ADRs are the decision record of the 1.0 surface, and details inside them go stale with every
change; the statements above are examples. The trim is in scope for 1.0 by the maintainer's
decision.

Evidence

• docs/engineering/documentation.md:15 (ADRs hold decision rationale) and :34 (documentation
  refactors are lossless relocations).
• The lines cited above. The longest ADRs today: ADR-0011 (136 lines), ADR-0027 (97), ADR-0032
  (96), ADR-0028 (87).

Done when

• ADR-0025 to ADR-0032 are re-audited and trimmed, and each relocated fact has exactly one canon
  owner.
• ADR-0001 to ADR-0023 are audited and trimmed.
• The stale statements above are gone. ADR-0008's fingerprint wording matches the implementation,
  or the fingerprint walks referenced schemas if the reachable-schema checks turn out not to cover
  them.
• No useful unique information is lost.