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probe(D-TGA-5): squash the chain of origin into the most-updated lane, gated on contradiction; blame survives - #1736
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… contradiction gate, blame) Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VncKoyG6JkpsoqhqTGTv3f
…ed target, contradiction gate, blame Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VncKoyG6JkpsoqhqTGTv3f
…EAS row 'a certificate replaces the deltas' squash_gate.rs: fmt only. Entry results: landing the squash equals landing the finals; blame over lanes survives; delta stays N while history grows k·N. STATUS_BOARD D-TGA-5 -> In PR (lab precursor). IDEAS: certificate replaces deltas, with 01G22yT6's determinism falsifier as next probe. FRUITS / entries / supersession indexes regenerated. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VncKoyG6JkpsoqhqTGTv3f
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…uence, not stochastic) Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VncKoyG6JkpsoqhqTGTv3f
# Conflicts: # .claude/board/FRUITS.md # .claude/board/IDEAS.md
…egation of undersampled Markov chains) Lumpable + deflatable => rank R, P = Pi P_hat Lambda; aggregates from J sampled columns with J depending only on R and p; P_hat recovered with L1 error <= 4 eps, independent of N. Mapped to thought-git as [H] with four named falsifiers (non-homogeneity, non-uniform lane draws, deflatability, SVD only cold). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VncKoyG6JkpsoqhqTGTv3f
Lane::final_state, ops and blame folded every write whatever the thought's Outcome, while next_version lands only Commit. Every fixture used Commit, so no test saw it. P8 lands a lane with Prune / Veto / Plan writes one thought per version and compares every read against the squash: it was red before this change (Prune write (5,1)=51 squashed), green after. Pruned and vetoed thoughts stay in order and the seal as history. Found by the falsifier co-architect of the 2026-10-23 coresearch on thought-git as a Markov chain. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VncKoyG6JkpsoqhqTGTv3f
Five scouts, crosswalk of 16 ideas, three co-architects. The papers' main results need a restart oracle, homogeneity and independent lanes; none hold (transducer, transient DAG, lanes measured dependent). What survives: min/max L/U bounds, partition-refinement congruence, the certificate/model split. One defect found and fixed in the squash gate (P8). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VncKoyG6JkpsoqhqTGTv3f
…ror) The substrate is deterministic; a probabilistic model is a counterfactual that the egglog/eggcc compiler must certify. The Markov/aggregation papers describe at most the search, never the certificate. Head = the thought whose compiled proof is admitted; the children's folds are its compilation material. Blocker named: no DR64 certified compiler (NoCertifiedCompiler). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VncKoyG6JkpsoqhqTGTv3f
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| fnv1a(&mut seal, u64::from(l.id)); | ||
| fnv1a(&mut seal, u64::from(t.id)); | ||
| for &(c, v) in &t.writes { |
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When a thought changes from Outcome::Commit to Prune, Veto, or Plan without changing its ID or writes, this loop produces exactly the same seal even though the squashed cells and blame change. For example, lane 3 containing thought 1 writing 41 to (4, 1) has the same seal whether that write lands or is pruned. This is a deterministic omission, not an incidental hash collision, and undermines the probe's claim that the seal tracks changes to the ordered history. Hash each thought's outcome as well, and extend the seal test with an outcome-only change.
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Resolves an add/add collision: #1736 (session 01Vnc) landed its own coresearch map at entries/2026-10-23-coresearch-thought-git-markov.md. Theirs is kept unchanged at that path; CC2's map moves to ...-markov-cc2.md with a file note, and the gap map's cross-reference is updated. entries/README.md regenerated, not hand-merged. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01G22yT6htkcdyXsihxxXdrg
… file attribution Catch-up entries from the merge commits; hygiene-only PRs (#1727, #1728, #1730, #1732-#1735) get none. #1738 is a correction and gets one. D-TGA-5's row named src/squash.rs under #1736; #1736 added only tests/squash_gate.rs, and the gate moved to src/squash.rs in #1739. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VncKoyG6JkpsoqhqTGTv3f
A lab probe, pre-registered before any code (
0dca6c52), for the first squash gate in thought-git. Every lane's chain of origin is squashed into the most-updated lane, the squash is refused on contradiction or divergence, and blame is kept over lanes. It is the precursor to STATUS_BOARD D-TGA-5. Claimed on EXO-50 (session_01VncKoyG6JkpsoqhqTGTv3f/034).Code. One new test file,
crates/thought-git-probe/tests/squash_gate.rs. The D-TGB-0 oracle (next_version) is the from-scratch reference.oracle.rs,slots.rsandreceipt.rsare unchanged.Results (
cd crates/thought-git-probe && cargo test --test squash_gate): 9 tests pass. The whole crate passes, and clippy-D warningsand fmt are clean.Versionas landing every lane's final state, on all 48 fixture cellsDivergence.oracle::squashkeeps the later value silently on the same inputContradictionDisables. Each anchor was asserted before the disable was applied, and the file was restored afterwards. Each one turned its named test red:
Board changes:
entries/2026-10-23-d-tga-5-squash-gate-preregistration.md, with its results;pearl.rs:259) and the next probe: a determinism falsifier for receipt replay, as proposed by session 01G22yT6;Open: slot reuse; a squash against a non-empty prior version; mid-chain readers (the lumpability condition, EXO-132); the CE64 59..63 promotion.
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