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| ''Conceptual diagram 4 of 5.'' Part of [[The Principia Machina/Hub|the TPM hub]].
| | #REDIRECT [[The Principia Machina/Diagrams/C4 Landing pipeline]] |
| * KIND: process
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| * LANGUAGE: Mermaid flow
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| * GENERATED FROM: declared by the human 2026-09-17; TPS 5.7-5.10, 6.2, 6.4
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| * STATUS: hand-authored at TPS 0.1.0; conceptual, kept by the human; never generated
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| * SOURCE SHA-256: <code>4a557e7efba653b20c00a99162e251182b8c43477654f8027652602084914bb6</code>
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| * KEY: [[The Principia Machina/Diagrams/Key for process diagrams|key for process diagrams]]: what each shape and arrow means
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| Rendered live from the source below, which is the text equivalent; if rendering is unavailable the source still stands.
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| {{#mermaid:
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| %% C4 Landing and collaboration pipeline with the post-refusal branch.
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| %% TPS 0.1.0: 5.7, 5.8, 5.9, 5.10, 6.2, 6.4.
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| flowchart TD
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| subgraph S1 ["1. Petition (5.8.2, 5.8.5, 5.7.4)"]
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| P1[(PETITION row: ACCOUNT, CAPABILITY, STATUS)] --> Q1[queue in revision order]
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| Q1 --> Q2[head acquires within the ACQUISITION WINDOW, else the next waiter]
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| end
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| subgraph S2 ["2. Assign (5.8.3, 5.9.2)"]
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| Q2 --> A1[/lead writes the ASSIGNMENT: BLOCK ID, GRANT, LEASED RANGE, RETURN PAGE/]
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| A1 --> A2[(SCHEDULE LOG: COMMISSIONED, OWNED BY, ETA)]
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| end
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| subgraph S3 ["3. Work locally (5.4.3, 5.9.3, 6.4)"]
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| A2 --> W1[local working instance: draft carrying the block ID]
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| W1 --> W2[local manifest rebuilt on every write]
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| W2 --> W3[benchmark quarantine: external values checked after termination]
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| end
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| subgraph S4 ["4. Return and vet (5.8.4, 6.2)"]
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| W3 --> R1[(RETURN on the staging subpage: RECORDS, USED RANGE, DIFFERENCE)]
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| R1 --> V1[lead vets the return as untrusted input]
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| V1 -- detection --> V2[/decision item to the human/]
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| V1 -- clean --> V3[incorporate; allocate identifiers; reclaim the unused range]
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| end
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| subgraph S5 ["5. Land (5.9.5, 5.9.8, 5.10.1)"]
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| V3 --> L1[push with grant number, block ID, conformance declaration]
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| L1 --> L2[TPX checks: grant not stale, holder is pusher, block ID not EXPIRED, declared TPS version current]
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| L2 -- pass --> L3[(records land; manifest rebuilt; BADGE written last)]
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| L3 --> L4[release valid only after the push]
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| L2 -- fail --> PR
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| end
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| subgraph S6 ["Post-refusal (5.9.7)"]
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| PR[read the control panel; apply to the lead: the lead's answer is authoritative]
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| PR -- neither reassigned nor landed --> PR1[new block ID with back-pointer; land under it]
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| PR -- reassigned --> PR2[enter the queue; wait for that block to land or expire]
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| PR -- landed --> PR3[compare with the landed result]
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| PR3 -- match --> PR4[(CORROBORATION RECORD; block closes CORROBORATED)]
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| PR3 -- mismatch --> PR5[audit: a new work block ending in a decision item]
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| PR2 --> PR
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| end
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| }}
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| <!-- A DOT-drawn preview of this pipeline exists as a derived image (render/C4_landing_and_collaboration_pipeline.preview.png, tagged with this source's hash); it is not a second source. -->
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| == Text equivalent ==
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| Stage 1 Petition: a PETITION row with CAPABILITY enters the queue in revision order; the head acquires within the ACQUISITION WINDOW (5.8.2, 5.8.5). Stage 2 Assign: the lead writes the ASSIGNMENT and the schedule log entry (5.8.3, 5.9.2). Stage 3 Work locally on the local instance under benchmark quarantine (5.4.3, 5.9.3, 6.4). Stage 4 Return and vet: the RETURN on the staging subpage is untrusted input; a detection becomes a decision item, a clean return is incorporated (5.8.4, 6.2). Stage 5 Land: the push carries grant, block ID and conformance declaration; TPX checks them and writes the badge last; release is valid only after the push (5.9.5, 5.9.8, 5.10.1). A refused push enters the post-refusal branch (5.9.7).
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| [[Category:The Principia Machina]]
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