Add stable v1 schema IDs and docs

docs/SCHEMAS.md

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+# Enodia Sentinel JSON Schemas
+
+Sentinel uses stable schema IDs for operator-facing JSON contracts. These IDs
+are lightweight compatibility markers, not external JSON Schema files. The v1
+rule is additive: future releases may add fields, but required v1 fields should
+not be removed, renamed, or change type.
+
+Schema IDs live in `enodia_sentinel/schemas.py`, and compatibility tests in
+`tests/test_schema_contracts.py` pin the required v1 fields.
+
+## `enodia.alert.v1`
+
+Single detection object, used inside alert snapshots and by commands such as
+`posture check --json`.
+
+Required fields:
+
+| Field | Type | Meaning |
+|---|---|---|
+| `sid` | integer | Stable signature/rule id. |
+| `severity` | string | `MEDIUM`, `HIGH`, or `CRITICAL`. |
+| `signature` | string | Stable machine-readable detection name. |
+| `classtype` | string | Snort/Suricata-style category. |
+| `key` | string | Cooldown/dedup identity. |
+| `detail` | string | Human-readable finding detail. |
+| `pids` | array | Process IDs tied to the finding. |
+
+## `enodia.alert.snapshot.v1`
+
+Structured alert sidecar written beside each text snapshot under `log_dir`.
+
+Required fields:
+
+| Field | Type | Meaning |
+|---|---|---|
+| `schema` | string | `enodia.alert.snapshot.v1`. |
+| `time` | string | ISO-8601 capture time. |
+| `host` | string | Hostname at capture time. |
+| `severity` | string | Highest severity in the snapshot. |
+| `incident_id` | string or null | Incident grouping id, when enabled. |
+| `alerts` | array | `enodia.alert.v1` objects. |
+| `processes` | array | Captured process context for alert PIDs. |
+
+## `enodia.incident.v1`
+
+Incident index record stored in `incidents.json`.
+
+Required fields:
+
+| Field | Type | Meaning |
+|---|---|---|
+| `schema` | string | `enodia.incident.v1`. |
+| `id` | string | Stable incident id. |
+| `host` | string | Host that produced the incident. |
+| `first_ts`, `last_ts` | number | Unix timestamps for first/last activity. |
+| `first_seen`, `last_seen` | string | ISO-8601 first/last activity times. |
+| `severity` | string | Highest incident severity. |
+| `signatures` | array | Unique detection signatures in the incident. |
+| `sids` | array | Unique SIDs in the incident. |
+| `pids` | array | Alert PIDs observed in the incident. |
+| `lineage` | array | Process-lineage IDs used for grouping. |
+| `snapshots` | array | Member snapshot filenames. |
+| `alert_count` | integer | Total alerts grouped into the incident. |
+
+`incident show --json` returns `enodia.incident.view.v1` with `schema`,
+`incident`, and `timeline`. The dashboard incident API returns the same schema
+plus `snapshots`. `incident export` returns `enodia.incident.bundle.v1` with
+`schema`, `incident`, and inlined `snapshots`.
+
+## `enodia.status.v1`
+
+Health/status object returned by `status --json` and `/api/status`.
+
+Required fields:
+
+| Field | Type | Meaning |
+|---|---|---|
+| `schema` | string | `enodia.status.v1`. |
+| `version` | string | Sentinel package version. |
+| `running` | boolean | Whether the daemon pid appears alive. |
+| `total_alerts` | integer | Count of retained alert snapshots. |
+| `counts` | object | Per-severity retained alert counts. |
+| `last_alert` | string or null | Most recent retained alert time. |
+| `ebpf`, `ebpf_exec`, `ebpf_syscall` | string | Last observed sensor states. |
+| `host` | string | Hostname. |
+| `heartbeat_age` | number or null | Seconds since heartbeat, if present. |
+| `heartbeat_stale` | boolean | Whether heartbeat exceeds configured max age. |
+
+## `enodia.response.plan.v1`
+
+Dry-run response plan from `respond plan <incident-id>`.
+
+Required fields:
+
+| Field | Type | Meaning |
+|---|---|---|
+| `schema` | string | `enodia.response.plan.v1`. |
+| `plan_id` | string | Stable plan id for the incident. |
+| `incident_id` | string | Source incident. |
+| `created_at` | string | ISO-8601 plan time. |
+| `mode` | string | Currently `dry-run`. |
+| `apply_supported` | boolean | Currently `false`. |
+| `summary` | object | Severity, signatures, snapshot/action counts. |
+| `actions` | array | Reviewable action proposals. |
+| `notes` | array | Operator cautions. |
+
+CLI-generated plans may also include `artifacts` with saved plan/audit paths.
+
+## `enodia.response.audit.v1`
+
+JSONL record appended when the CLI persists a response plan.
+
+Required fields:
+
+| Field | Type | Meaning |
+|---|---|---|
+| `schema` | string | `enodia.response.audit.v1`. |
+| `time` | string | ISO-8601 audit time. |
+| `event` | string | Currently `response_plan_generated`. |
+| `actor` | string | Caller identity supplied by the CLI/workflow. |
+| `plan_id` | string | Persisted plan id. |
+| `incident_id` | string | Source incident id. |
+| `mode` | string | Plan mode. |
+| `apply_supported` | boolean | Whether the plan supports apply. |
+| `action_count` | integer | Number of proposed actions. |
+| `plan_path` | string | Persisted plan artifact path. |