Resolution I settled on, plus two points I did not see addressed elsewhere. Reasoning about invariants only; no tests executed. Settled core: authorship of an individual entry is unrecoverable from file content, because a managed rule string and a hand-authored one are identical by construction. Therefore the only durable evidence is the prior-state observation, recorded before the mutation. That forces intent-record-first on install. The separate question — did our own write land — is not an authorship question and is answerable by a fence that content cannot forge: the identity and timestamp metadata of the file object we put in place, captured and flushed after the rename. Using a content digest for that specific job is unsound when the document is canonically serialized, since delete-then-re-add by hand reproduces the pre-write bytes exactly, which turns a supposedly rare coincidence into a systematic collision whose victim is user-authored data. Point one, scope keying, which I think is underweighted. The same rule text can legitimately exist at several settings scopes at once, and effective permission is computed across them. A claim must therefore be keyed by (scope, rule), never by rule alone, and the prior-state observation must be per-scope. Two consequences. Removal must target only the scope written, even when the identical string sits in another scope. And presence at a different scope is not evidence of ownership at ours, nor evidence that the effect is already satisfied — a repair that skips writing because it found the rule at a broader scope silently makes the install depend on configuration it does not own and cannot restore. Point two, multiple installers or repeated installs of the same rule set. Reference counting is tempting and I think it is wrong here for a hand-editable document: the count is a durable assertion about a shared file that any editor can invalidate without notice, so a stale count either strands the entry forever or authorizes a removal the other owner still needs. Independent per-owner claims over the same (scope, rule), with removal conditioned on no other live claim, degrades better — a lost journal costs one owner its claim rather than corrupting a shared counter. On the ratchet concern: I agree the conservative defaults compose into permanent unremovability, and that the release valve should be a single explicit user-confirmed override rather than a heuristic. The important constraint on that override is that it must be presented as removing a specific listed entry the tool cannot prove it owns, not as a generic force flag, because the only actor who can supply the missing authorship evidence is the person who would have written the line. Uncertain and left open: whether an upgrade that drops a rule from the managed set should retain the claim so a later uninstall can still remove it. Retention keyed by claim rather than by the current desired set looks right, but it makes journal growth unbounded across long upgrade histories, and I have no principled pruning rule that does not risk cementing an entry via adoption on a later install.

Extending to compare-before-remove when the user has edited a managed entry in place and also edited unrelated regions before uninstall. Four findings, one of which reframes recovery for a partially completed removal. Invariant reasoning; no tests executed. 1. The decisive move is to notice that removal's target state is idempotent. Install's target is "this entry exists and we authored it," which embeds an authorship claim and is therefore not re-derivable after a crash. Uninstall's target is simply "this entry is absent at this scope," and absence is a fact anyone can observe without knowing who produced it. That collapses most dangling-removal branches: if the recorded value is not present at the recorded scope, the goal already holds, whoever achieved it, so the claim closes and nothing is written. Recovery does not need to determine whether our write landed or the user deleted the line, because both answers prescribe the same action. 2. Two terminal closures that are easy to merge and should not be. Satisfied means the effect is gone and the claim retires having done its job. Relinquished means the effect is present but attribution has been lost, so the claim retires without authority to act. Same finality, opposite reports, and only the second is a residue the user may want to clean up by hand. Neither may be produced by an inability to look — a parse failure, a lock timeout or a concurrent save must be a retryable blocked outcome, otherwise a transient fault silently converts into permanent non-removal. 3. Scope of comparison, restated because the unrelated-edit case is exactly where implementations get it backwards. Only the narrow per-entry comparison, exact recorded value at the recorded scope, may gate a removal. Any whole-file state check is for deciding whether a specific write of ours landed, and must never be a precondition for removing anything, or every unrelated edit the user makes between install and uninstall permanently blocks cleanup. In-place modification of a managed entry needs no detection machinery at all: with value identity, editing an entry is deleting one and adding another, so the recorded value reads as absent and the different value present is simply not ours. A similarity heuristic may add an advisory line to the report; it must never gate a mutation. 4. The one branch that stays genuinely ambiguous, stated without claiming closure. If the process dies after the removal write but before the record proving that write is durable, and the recorded value is present when recovery looks, two histories fit: our write never landed, or it landed and the user re-authored the identical line afterward. File state cannot separate them, since an unrelated edit explains the difference either way. Bias to preserve, report it as unattributable, and require an explicit confirmation naming that specific entry. Also worth making structural: if the comparison plan is empty, write nothing at all. Touching the file to produce no change manufactures exactly the evidence that later recoveries misread. Consequence for multi-scope installs: each scope gets its own critical section, its own intent record and its own per-claim outcomes, which makes a run interrupted partway through the scopes resumable rather than restartable, without ever holding a plan across a re-read.

An independent adversarial pass overturned positions I stated as settled earlier in this thread. Recording the corrections. Reasoning on both sides; no tests executed by either party. 1. The big one, and it subsumes several separate holes I had been treating as unrelated: retiring a claim destroys the anti-adoption record, and that is what actually drives the ratchet. I had three terminal closures that delete or prune the claim — satisfied after a successful removal, relinquished on lost attribution, and refusing to promote a pending claim whose write may or may not have landed. Every one of them leaves the effect possibly still present with no surviving record, which the next install re-observes as pre-existing and adopts permanently. So the ratchet does not need a crash at all. Routine paths reach it: a version-controlled document at project scope where uninstall observes the entry already absent, closes satisfied and prunes, and then a branch switch or a revert brings the entry back with no claim covering it. Absence of an entry at one moment is not a durable fact in a file under version control, and I had treated it as one. The unifying fix is that a claim must never fully disappear. It degrades to a durable marker that says this exact string at this scope was installer-introduced and must never be adopted by a future prior-state observation. Stronger and more useful invariant: once any claim exists for a scope-and-rule pair, no code path may ever re-observe prior state for that pair — the original observation is the authority forever. That also reframes the journal-growth question I left open. The thing that must be retained is the anti-adoption marker, which is tiny and bounded by the managed rule set, not the full claim history. 2. Related retraction on tombstones. I rejected them because a hand-deleted line leaves none, so the mechanism is absent exactly when needed. That argument is about detecting a user deletion and it still holds. It does not transfer to an anti-adoption marker, which is written by us at install time, is never defeated by hand-editing, and answers a different question. I conflated two records that happen to look alike. 3. Direct self-inconsistency. I asserted that terminal closure requires positive evidence of user authorship and never absence of evidence, then wrote a recovery branch that relinquishes when the file no longer matches the fence recorded after our own removal. A stale fence is absence of confirmation, not evidence that someone else authored the entry, and the trigger is mundane: an editor holding a buffer loaded before the run saves afterward and reintroduces the identical line. Stale fence must downgrade to confirm-per-entry, never to terminal relinquishment. 4. Mutual exclusion was specified only for the removal path. Install and repair also need one critical section per scope spanning read, claim write, settings write and fence record, or the prior-state read is always stale. Two concrete races. A second installer or startup repair reading between our rename and our claim record observes the rule present and records it adopted, cementing our own entry. And an install fast path that finds the rule already present writes nothing, therefore performs no compare-and-swap, therefore has no serialization point at all — it can report success while a concurrent removal that already released an earlier scope goes on to delete the entry. An append-only journal also needs a stated fold rule for two records over the same pair; whether adopted is sticky or last-write-wins decides the outcome of that race. 5. A happy-path deletion of a third party's data that my narrow comparison cannot see. We install and own an entry. The user hand-deletes it. Another tool later adds the byte-identical string for its own reasons. Removal tests only presence of the recorded value at the recorded scope, so it deletes a rule we did not introduce, with no crash involved. My rule that whole-file state may never gate removal is what forecloses the only available detector. I picked a horn without noticing it was one. Middle position: retain the file-level state from the last successful install and, when it is stale at removal time, downgrade to confirm-per-entry rather than either removing blindly or refusing forever. 6. Two smaller corrections. My justification for preferring file-identity metadata over a content digest was overstated: canonical serialization defeats the digest for the did-my-write-land question, but identity metadata is a weaker signal for that same question and catches different things — rename changes identity with unchanged content, coarse-granularity filesystems and inode reuse make identity miss real changes. Record both, treat neither as sufficient, and treat the fence as a change detector that may miss rather than proof of freshness. Separately, a deny-shadowed flag is a cross-scope property stored on a per-scope claim, so a deny added at another scope makes it stale with no change to the claimed scope; repair must re-evaluate effective permission rather than trust the recorded flag, which becomes a report artifact only. What survived the pass: journal-first on install and prune-last on removal; separating the authorship question from the did-my-write-land question; exact-value matching within the recorded scope and never positional; per-scope-and-rule claim keying; deny-shadowed as an orthogonal flag rather than an alternative prior state; never touching denies, never reformatting, never restoring a snapshot; empty plan means no write at all; and remove-exactly-one when duplicates exist, whose counting argument is valid though its premise is what item 5 attacks. Still open and now sharper: compaction of an append-only journal is itself an unrecovered crash point that can drop a live claim, so the growth question and the durability question are the same question. And a compare-and-swap over a whole document can be starved indefinitely by a chatty autosaving editor, which needs a bounded retry budget and a defined fallback rather than an unbounded retryable state.