chore: open maintenance packet for opencode 1.15.3

[Spenquatch]

PR summary

Automated maintenance packet for opencode target 1.15.3.

• canonical execution contract: docs/agents/lifecycle/opencode-maintenance/HANDOFF.md
• request artifact: docs/agents/lifecycle/opencode-maintenance/governance/maintenance-request.toml
• branch: automation/opencode-maintenance-1.15.3
• opened from: .github/workflows/agent-maintenance-open-pr.yml
• prompt sha256: da7a2d0b29c171a4c1a9a9568dca4c71e1ddef3726ac123a817f407280c6be0b

Support-surface audit

• required: true
• pre-run debt count: 15
• expected post-run debt count: 15
• discovered upstream surface rows: 0
• preexisting unsupported rows: 15
• required uplifts this run:
• none
• deferred preexisting gaps:
• opencode run run via requires_new_architectural_seam (TODOS.md#close-opencode-non-tui-maintenance-gaps)
• opencode acp acp via requires_new_architectural_seam (TODOS.md#close-opencode-non-tui-maintenance-gaps)
• opencode attach attach via requires_new_architectural_seam (TODOS.md#close-opencode-non-tui-maintenance-gaps)
• opencode models models via requires_new_architectural_seam (TODOS.md#close-opencode-non-tui-maintenance-gaps)
• opencode providers providers via requires_new_architectural_seam (TODOS.md#close-opencode-non-tui-maintenance-gaps)
• opencode serve serve via requires_new_architectural_seam (TODOS.md#close-opencode-non-tui-maintenance-gaps)
• opencode web web via requires_new_architectural_seam (TODOS.md#close-opencode-non-tui-maintenance-gaps)
• opencode run --format via requires_new_architectural_seam (TODOS.md#close-opencode-non-tui-maintenance-gaps)
• opencode run --dir via requires_new_architectural_seam (TODOS.md#close-opencode-non-tui-maintenance-gaps)
• opencode run --attach via requires_new_architectural_seam (TODOS.md#close-opencode-non-tui-maintenance-gaps)
• opencode run --model via requires_new_architectural_seam (TODOS.md#close-opencode-non-tui-maintenance-gaps)
• opencode run --continue via requires_new_architectural_seam (TODOS.md#close-opencode-non-tui-maintenance-gaps)
• opencode run --session via requires_new_architectural_seam (TODOS.md#close-opencode-non-tui-maintenance-gaps)
• opencode run --fork via requires_new_architectural_seam (TODOS.md#close-opencode-non-tui-maintenance-gaps)
• opencode run --agent via requires_new_architectural_seam (TODOS.md#close-opencode-non-tui-maintenance-gaps)

Next step

Follow docs/agents/lifecycle/opencode-maintenance/HANDOFF.md exactly. This PR summary is derivative from the same execution-packet renderer.

Exact maintained-agent prompt

# Packet PR Maintenance Prompt (`1.15.3`)

This template renders the exact maintained-agent prompt for `opencode` packet execution.
`docs/agents/lifecycle/opencode-maintenance/HANDOFF.md` remains canonical and `governance/pr-summary.md` is derivative.

@codex

## Goal

Execute the automated maintenance packet for `opencode` target `1.15.3`.

## Frozen request contract

- Read `docs/agents/lifecycle/opencode-maintenance/governance/maintenance-request.toml` before changing code or docs.
- Read the packet-owned `support_surface_audit` block before deciding whether the run can succeed.
- Treat `docs/agents/lifecycle/opencode-maintenance/HANDOFF.md` as canonical for writable surfaces, read-only inputs, ordered commands, green gates, and recovery.
- Treat `.github/workflows/agent-maintenance-open-pr.yml` as the opening workflow source.
- Do not write outside the execution contract frozen in the request packet.

## Manifest inputs

- `cli_manifests/opencode/README.md`
- `cli_manifests/opencode/VALIDATOR_SPEC.md`
- `cli_manifests/opencode/RULES.json`
- `cli_manifests/opencode/SCHEMA.json`
- `cli_manifests/opencode/current.json`
- `cli_manifests/opencode/latest_validated.txt`
- `cli_manifests/opencode/wrapper_coverage.json`

## Required workflow

1. Compare the current validated baseline from `cli_manifests/opencode/latest_validated.txt` against the target `1.15.3` artifacts.
2. Use `support_surface_audit` to classify newly discovered non-TUI surface, preexisting non-TUI debt, required uplifts, and allowed deferrals.
3. Land bounded wrapper/backend/manifest/publication updates for every row in `required_uplifts_this_run`.
4. Refresh or create version-scoped manifest artifacts under `cli_manifests/opencode/snapshots/1.15.3/`, `cli_manifests/opencode/reports/1.15.3/`, and `cli_manifests/opencode/versions/1.15.3.json` as required by the packet.
5. Leave closeout manual; record it only with `close-agent-maintenance` after the declared green gates pass.

## Done criteria

- Changes stay within the writable surfaces frozen in `docs/agents/lifecycle/opencode-maintenance/governance/maintenance-request.toml`.
- No newly discovered non-TUI surface remains unresolved unless the packet records one allowed deferral.
- `cargo run -p xtask -- codex-validate --root cli_manifests/opencode` passes.
- The remaining ordered commands and green gates from `docs/agents/lifecycle/opencode-maintenance/HANDOFF.md` pass or are captured in maintainer follow-up notes.

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