feat: local XLSX/CSV rosters and explicit submission lists (OSS-155)

[Acture]

Before this change, a teacher without Canvas could only pass a roster as a CSV whose columns sat at fixed positions. Now assignment.toml [input] describes a local class in one of two ways:

• Table mode. Submission paths plus a CSV/XLSX roster, with sheet, header_row and a columns mapping by exact heading or one-based column number.
• Explicit list. [[input.students]] gives each student ID, an optional name and the exact files or archives.

Both modes produce the same input model as Canvas and go through the same ownership/item matcher. grade, run and match resolve the same input. rescore rebuilds it from the recorded assignment file. Configured paths are relative to the assignment file, and CLI paths and --roster override them in table mode. Student IDs stay text, so 001 keeps its zeros. A numeric Excel ID cell is refused because its zeros cannot be recovered. Every unusable row, duplicate ID and bad path is reported against file [sheet]:row.

examples/bundles/local_import grades the same three students through the CSV mapping and through the explicit list.

Consequences before merging

• An unusable roster row is now an error that stops grading; it was a warning. A table with no usable student row is also refused. Blank rows (,,, empty separator rows) are skipped.
• Each repeat of an identical roster ID is reported at its own row and merged. Conflicting rows are still refused.
• summarize --roster and db import-roster read tables through the same mapping via --assignment. They print diagnostics with their real severity and refuse a roster with errors; before, they silently named nobody or imported 0 students. The positional roster of db import-roster is optional when --assignment gives a path.
• grade --db, rescore --db and db save all import the identities frozen in the record, never the table as it is now. A missing name no longer erases a stored one (COALESCE, as for canvas_id), so db import-roster cannot blank a stored name either.
• Submission paths can be individual files and archives. A file named explicitly is never skipped as noise (.*, __*). Student rules see only its file name, never the directories above it.
• load_roster returns anyhow::Result; RosterError and DiscoveryError::NotADirectory are gone. .xlsx/.xlsm open as workbooks, and .xls/.ods get a "save as .xlsx or .csv" message. Every other name is read as CSV, as before.
• --canvas together with an assignment that has [input] is refused. A diagnostic's Display now starts with its location.
• Not handled here: the record does not save the roster and submission paths resolved from [input], so the export Info sheet shows them empty. That changes the record format: OSS-333.

Review

The first commit was reviewed by 8 lens-specific finders. Each deduplicated finding then went to three verifiers with different lenses (code path, intent, impact), and a completeness critic followed. 13 of 21 findings held; 63f871c fixes 12 of them, and the 13th is OSS-333. A probe found one more: blank rows refused grading. It is fixed in the same commit, and it shows as refuted in the review output only because the fix landed while the verifiers were reading. A second pass over the fix commit, 4 reviewers with 2 skeptics each, confirmed nothing. Two of its contested points are fixed in 089c362: a roster file given beside an explicit list is read, and the explicit-file rules are documented.

Tests

tests/local_import.rs imports one class through CSV, XLSX and the explicit list. It checks that identities, files and non-submitters are equal across the three, then runs grade, export, rescore and db save on each. New cases cover:

• blank rows and an empty table
• summarize/import-roster with and without the mapping
• a nameless record keeping stored names
• explicit __main__.py, and a level-0 directory rule on an explicit file (the old code keyed it local:/)
• rescoring an unchanged record from another directory, and the refusal message after an edit
• a mistyped input.submissions entry

Each new test was checked against the old code with its fix reverted. Roster unit tests cover repeat locations, the empty-roster error, and extension handling.

cargo test --workspace: 442 passed, including the Canvas wiremock tests. cargo clippy --workspace --all-targets -- -D warnings and cargo fmt --check are clean. The local-import example and the commands its README adds were run from the repository root.

Notes: notes/docs/matching.md, published in 785624f; the pointer here is 785624f.

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Summary by CodeRabbit

• New Features

  • Configure local submissions and rosters for grading, running, matching, summaries, and database imports.
  • Load rosters from CSV or Excel, with configurable sheets, header rows, and column mappings.
  • Assign files or archives to specific students, or use directories of submissions.
  • View row- and file-specific diagnostics for invalid roster entries and submission paths.

• Bug Fixes

  • Preserve existing student names when importing roster entries without a name.
  • Use the roster saved with a grading record when saving a revision.

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⚙️ Run configuration

• Configuration used: Organization UI
• Review profile: CHILL
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• Run ID: 4c786c91-ee3f-455e-98e8-0a4d8f024a5d

📥 Commits

Reviewing files that changed from the base of the PR and between 70c48d5 and def60b9.

📒 Files selected for processing (1)

• src/core/src/archive.rs

📝 Walkthrough

Walkthrough

The change adds assignment-configured local submission paths, CSV/XLSX roster tables, and explicit student-to-file manifests. CLI commands resolve these inputs, report validation diagnostics, and use recorded roster data when saving grading revisions.

Changes

Local input and roster handling

Layer / File(s)	Summary
Roster table configuration and loading src/core/src/input/table.rs, src/core/src/roster.rs, src/core/src/models/..., src/core/src/assignment.rs, src/core/src/models/config.rs, src/core/Cargo.toml	Adds CSV/XLSX roster loading, configurable sheet/header/column selection, row validation, and located diagnostics. Assignment configuration includes the local input settings.
Local source resolution and file discovery src/core/src/input/local.rs, src/core/src/discovery.rs, src/core/src/input/mod.rs	Resolves configured paths and explicit student files, then discovers selected files and archives alongside directory submissions.
CLI commands and recorded roster data src/cli/src/main.rs, src/cli/src/db/roster.rs, src/core/src/record.rs	Connects resolved inputs to grading and roster commands. Database saves import roster identities reconstructed from the grading record.
Input-flow validation and example src/cli/tests/local_import.rs, src/cli/Cargo.toml, README.md, CLAUDE.md, examples/bundles/local_import/*	Adds integration coverage and a local-import example. Documentation describes roster tables, explicit manifests, CLI overrides, and validation behavior.

Notes subproject reference

Layer / File(s)	Summary
Subproject reference update notes	Updates the recorded notes subproject commit.

Priority: ⬇️ Low

Estimated code review effort: 4 (Complex) | ~60 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant CLI as prepare_batch
  participant Config as Config.resolve
  participant Table as table.load
  participant Discovery as load_local_input
  CLI->>Config: Resolve paths, roster, and matching configuration
  Config->>Table: Load configured roster table
  Table-->>Config: Return roster and diagnostics
  Config-->>CLI: Return resolved paths and roster
  CLI->>Discovery: Load resolved submission paths
  Discovery-->>CLI: Return discovered local input

Loading

Merge Risk: 🔵 Low · up to 70c48

A narrow manifest configuration can produce an incomplete grading record instead of failing. Reject extraction-directory failures before merging, or accept this bounded risk with a follow-up.

Security Architecture Review

Security architecture risk: 🟡 Moderate · up to 70c48

Roster validation and recorded identities improve grading consistency. However, explicitly selected inputs can overlap archive extraction locations, potentially losing submissions or producing incomplete grades. This is a local, configuration-dependent risk, not an established remote compromise.

Retained concerns

• Medium · reliability · inferred: The new explicit-input contract does not visibly reserve archive extraction locations against other selected inputs. A manifest can select both p/a.zip and the regular file p/.scriptmark_extracted/a.zip: the latter occupies the former's extraction target, making preparation fail with only a warning. Selecting a file below that target can instead expose it to deletion or replacement during extraction. These configuration-dependent overlaps threaten submission ownership and failure containment because grading can continue with missing or altered inputs. Canonical duplicate detection and archive-entry traversal checks address different boundaries.

Security review details

Security Blast Radius

• inferred — The identified overlap scenario requires selected local paths and affects extraction files and the resulting submission set and grading record. Student archive bytes are untrusted, but selection and identity overrides are teacher-owned configuration. The evidence does not establish remote reachability or additional tenant, service, or credential authority.

Security Findings and Attack Paths

• inferred — Overlapping explicit inputs can violate the extractor's assumption that its target belongs to one archive alone. Target preparation failure is a warning and therefore does not activate the CLI's error-only grading gate. This supports a submission-integrity and failure-containment concern, not a verified sandbox escape.

Trust Boundaries and Controls

• observed — Explicit manifests check that each selected path is a file and canonicalize it for duplicate assignment detection. Roster confirmation controls trusted identity metadata, and record persistence excludes unconfirmed filename tokens. These controls do not themselves establish separation between selected inputs and extraction outputs.

Resilience and Maintainability Implications

• observed — The unchanged archive implementation rejects traversal components, flattens entry names, checks advertised-size and file-count budgets, and rolls back failed entry writes. It clears previous extraction state before opening a replacement archive and can return successfully extracted entries after a later archive failure. These existing controls are not whole-operation atomicity or input/output reservations.

Hardening Proposals

• proposed — Reserve extraction outputs against every selected input before mutation, or use a private per-run extraction workspace. Treat failure to prepare that workspace as an input-loading failure rather than an empty submission.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 63.64% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 66 functions across 14 files. (9 skipped:…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely summarizes the main changes: local XLSX/CSV roster support and explicit submission lists.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 63.64% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 66 functions across 14 files. (9 skipped: 9 unsupported.)

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Actionable comments posted: 1

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Inline comments:
Review comments at @src/core/src/discovery.rs:
- Around line 69-76: Update extraction-directory preparation failure handling in
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ℹ️ Review info

⚙️ Run configuration

• Configuration used: Organization UI
• Review profile: CHILL
• Plan: Advanced
• Run ID: cd052481-cf75-47db-88c8-38a88050d528

📥 Commits

Reviewing files that changed from the base of the PR and between fdf076f and 70c48d5.

⛔ Files ignored due to path filters (1)

• examples/bundles/local_import/roster.csv is excluded by !**/*.csv

📒 Files selected for processing (23)

• CLAUDE.md
• README.md
• examples/bundles/local_import/README.md
• examples/bundles/local_import/assignment.toml
• examples/bundles/local_import/manifest.toml
• examples/bundles/local_import/submissions/001_work.py
• examples/bundles/local_import/submissions/002_work.py
• examples/bundles/local_import/tests/double.toml
• notes
• src/cli/Cargo.toml
• src/cli/src/db/roster.rs
• src/cli/src/main.rs
• src/cli/tests/local_import.rs
• src/core/Cargo.toml
• src/core/src/assignment.rs
• src/core/src/discovery.rs
• src/core/src/input/local.rs
• src/core/src/input/mod.rs
• src/core/src/input/table.rs
• src/core/src/models/config.rs
• src/core/src/models/submission.rs
• src/core/src/record.rs
• src/core/src/roster.rs

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